Perianal and Perirectal Abscess (Clinical)

Epidemiology and Etiology

Epidemiology^[2,4,5]

• Approximately 100,000 new cases per year in the United States
• Age:
  • Usually presents between 20 and 60 years of age
  • Mean: 40 years
• Twice as common in men as in women
• 30% of patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship report a prior history of anorectal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease.

Etiology^[1–5]

Anal glands, found in the intersphincteric Intersphincteric Perianal and Perirectal Abscess plane, drain into crypts found along the circumference of the dentate/ pectinate line Pectinate line Rectum and Anal Canal: Anatomy. Infection of an obstructed glandular crypt may occur due to:

• Nonspecific obstruction (approximately 90% of cases)
• Inflammatory bowel disease (especially Crohn’s disease)
• Trauma
• Malignancy Malignancy Hemothorax 
• Extension Extension Examination of the Upper Limbs of another infection:
  • Diverticulitis Diverticulitis Inflammation of a diverticulum or diverticula. Diverticular Disease
  • Pelvic inflammatory disease Pelvic inflammatory disease Pelvic inflammatory disease (PID) is defined as a polymicrobial infection of the upper female reproductive system. The disease can affect the uterus, fallopian tubes, ovaries, and adjacent structures. Pelvic inflammatory disease is closely linked with sexually transmitted diseases, most commonly caused by Chlamydia trachomatis, Neisseria gonorrhoeae, and Gardnerella vaginalis. Pelvic Inflammatory Disease

Common bacteria Bacteria Bacteria are prokaryotic single-celled microorganisms that are metabolically active and divide by binary fission. Some of these organisms play a significant role in the pathogenesis of diseases. Bacteriology:

• Escherichia coli Escherichia coli The gram-negative bacterium Escherichia coli is a key component of the human gut microbiota. Most strains of E. coli are avirulent, but occasionally they escape the GI tract, infecting the urinary tract and other sites. Less common strains of E. coli are able to cause disease within the GI tract, most commonly presenting as abdominal pain and diarrhea. Escherichia coli
• Staphylococcus aureus Staphylococcus aureus Potentially pathogenic bacteria found in nasal membranes, skin, hair follicles, and perineum of warm-blooded animals. They may cause a wide range of infections and intoxications. Brain Abscess
• Streptococcus Streptococcus Streptococcus is one of the two medically important genera of gram-positive cocci, the other being Staphylococcus. Streptococci are identified as different species on blood agar on the basis of their hemolytic pattern and sensitivity to optochin and bacitracin. There are many pathogenic species of streptococci, including S. pyogenes, S. agalactiae, S. pneumoniae, and the viridans streptococci. Streptococcus
• Enterococcus Enterococcus Enterococcus is a genus of oval-shaped gram-positive cocci that are arranged in pairs or short chains. Distinguishing factors include optochin resistance and the presence of pyrrolidonyl arylamidase (PYR) and Lancefield D antigen. Enterococcus is part of the normal flora of the human GI tract. Enterococcus
• Proteus Proteus Proteus spp. are gram-negative, facultatively anaerobic bacilli. Different types of infection result from Proteus, but the urinary tract is the most common site. The majority of cases are caused by Proteus mirabilis (P. mirabilis). The bacteria are part of the normal intestinal flora and are also found in the environment. Proteus
• Prevotella Prevotella A genus of gram-negative, anaerobic, nonsporeforming, nonmotile rods. Organisms of this genus had originally been classified as members of the bacteroides genus but overwhelming biochemical and chemical findings in 1990 indicated the need to separate them from other bacteroides species, and hence, this new genus was established. Dog and Cat Bites
• Peptostreptococcus Peptostreptococcus A genus of gram-positive, anaerobic, coccoid bacteria that is part of the normal flora of humans. Its organisms are opportunistic pathogens causing bacteremias and soft tissue infections. Perianal and Perirectal Abscess
• Porphyromonas Porphyromonas A genus of gram-negative, anaerobic, nonsporeforming, nonmotile rods or coccobacilli. Organisms in this genus had originally been classified as members of the bacteroides genus but overwhelming biochemical and chemical findings indicated the need to separate them from other bacteroides species, and hence, this new genus was created. Dog and Cat Bites
• Fusobacteria Fusobacteria A genus of gram-negative, anaerobic, rod-shaped bacteria found in cavities of humans and other animals. No endospores are formed. Some species are pathogenic and occur in various purulent or gangrenous infections. Perianal and Perirectal Abscess
• Bacteroides Bacteroides Bacteroides is a genus of opportunistic, anaerobic, gram-negative bacilli. Bacteroides fragilis is the most common species involved in human disease and is part of the normal flora of the large intestine. Bacteroides
• Clostridium

Risk factors^[1–5]

• Immunosuppression:
  • Diabetes Diabetes Diabetes mellitus (DM) is a metabolic disease characterized by hyperglycemia and dysfunction of the regulation of glucose metabolism by insulin. Type 1 DM is diagnosed mostly in children and young adults as the result of autoimmune destruction of β cells in the pancreas and the resulting lack of insulin. Type 2 DM has a significant association with obesity and is characterized by insulin resistance. Diabetes Mellitus
  • Chemotherapy Chemotherapy Osteosarcoma
  • HIV HIV Anti-HIV Drugs
• Smoking Smoking Willful or deliberate act of inhaling and exhaling smoke from burning substances or agents held by hand. Interstitial Lung Diseases
• Rectal prolapse Rectal prolapse Rectal prolapse, also known as rectal procidentia, is the protrusion of rectal tissue through the anus. The tissue may include just the mucosa or the full thickness of the rectal wall. Common risk factors include chronic straining, constipation, bowel motility disorders, and weakening of the pelvic floor muscles. Rectal Prolapse

Classification and Pathophysiology

Classification^[2,3,8]

The classification of anorectal abscesses is based on their location.

• Perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease (most common):
  • The anus is surrounded by the perianal space, which extends and continues with the fat of the buttocks.
  • As the perianal skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions can be traversed, abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease is seen as a tender, fluctuant Fluctuant Dermatologic Examination mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast at the anal verge.
• Ischiorectal Ischiorectal Perianal and Perirectal Abscess (ischioanal):
  • The ischiorectal Ischiorectal Perianal and Perirectal Abscess space is found lateral and posterior to the anus and inferior to the levator ani.
  • Lateral to this space is the ischium, and medial to the space is the external anal sphincter External anal sphincter Rectum and Anal Canal: Anatomy.
  • Infection of the ischiorectal Ischiorectal Perianal and Perirectal Abscess space is seen as a tender, fluctuant Fluctuant Dermatologic Examination mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast in the buttocks.
• Intersphincteric Intersphincteric Perianal and Perirectal Abscess:
  • The intersphincteric Intersphincteric Perianal and Perirectal Abscess space separates the internal and external anal sphincters.
  • Abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease can be difficult to diagnose, but the mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast can be seen protruding into the lumen.
• Supralevator Supralevator Perianal and Perirectal Abscess:
  • The supralevator Supralevator Perianal and Perirectal Abscess space is above the levator ani.
  • Abscesses can be from:
    • A local cryptoglandular infection 
    • An inflammatory disease (e.g., Crohn’s disease)
    • A downward extension Extension Examination of the Upper Limbs of an intraperitoneal Intraperitoneal Peritoneum: Anatomy abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
  • Affected individuals have perianal pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways and fever Fever Fever is defined as a measured body temperature of at least 38°C (100.4°F). Fever is caused by circulating endogenous and/or exogenous pyrogens that increase levels of prostaglandin E2 in the hypothalamus. Fever is commonly associated with chills, rigors, sweating, and flushing of the skin. Fever.
  • External findings are usually not found; therefore, imaging is needed.
• Horseshoe:
  • Complex perirectal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease with a characteristic “U-shape”
  • Abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease spreads semicircumferentially, most often forming posterior to the anal canal

Pathophysiology^[1–3]

• Obstruction of an anal crypt gland allows bacterial growth → abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
• The abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease can spread along planes to:
  • Intersphincteric Intersphincteric Perianal and Perirectal Abscess, ischiorectal Ischiorectal Perianal and Perirectal Abscess, or supralevator Supralevator Perianal and Perirectal Abscess spaces → perirectal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
  • Perianal skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions → perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease

Clinical Presentation and Diagnosis

Symptoms^[2,4,5,7]

The symptoms of a perirectal or perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease can vary based on its location, but may include:

• Anal or rectal symptoms:
  • Pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways:
    • Severe
    • Constant  
    • Dull, sharp, aching, or throbbing
    • May be exacerbated by bowel movements or sitting
  • Constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation or diarrhea Diarrhea Diarrhea is defined as ≥ 3 watery or loose stools in a 24-hour period. There are a multitude of etiologies, which can be classified based on the underlying mechanism of disease. The duration of symptoms (acute or chronic) and characteristics of the stools (e.g., watery, bloody, steatorrheic, mucoid) can help guide further diagnostic evaluation. Diarrhea
  • Purulent drainage
  • Rectal bleeding
• Occasional urinary retention Urinary retention Inability to empty the urinary bladder with voiding (urination). Delirium
• Constitutional symptoms Constitutional Symptoms Antineutrophil Cytoplasmic Antibody (ANCA)-Associated Vasculitis:
  • Fever Fever Fever is defined as a measured body temperature of at least 38°C (100.4°F). Fever is caused by circulating endogenous and/or exogenous pyrogens that increase levels of prostaglandin E2 in the hypothalamus. Fever is commonly associated with chills, rigors, sweating, and flushing of the skin. Fever (21%)
  • Chills Chills The sudden sensation of being cold. It may be accompanied by shivering. Fever
  • Malaise Malaise Tick-borne Encephalitis Virus
  • Fatigue Fatigue The state of weariness following a period of exertion, mental or physical, characterized by a decreased capacity for work and reduced efficiency to respond to stimuli. Fibromyalgia

Physical exam^[2,4,5,7]

• Perianal swelling Swelling Inflammation and erythema Erythema Redness of the skin produced by congestion of the capillaries. This condition may result from a variety of disease processes. Chalazion may be seen.
• Depending on the location, external or digital rectal exam may reveal:
  • Swelling Swelling Inflammation
  • Tenderness
  • Fluctuance Fluctuance Examination of the Breast
• Spontaneous drainage may be bloody or purulent.

Diagnosis^[2,4,5,7]

The diagnosis of a perianal or ischiorectal Ischiorectal Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease is usually made clinically. However, CT, MRI, or ultrasonography may be useful for identifying:

• A deep abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
• A potential intra-abdominal source of infection

Diagnostic approach:^{[2,4,5,9–11,14]}

Note: The following diagnostic measures are summarized from different sources. Recommendations may vary based on practice location.

• History and clinical presentation
• Physical exam can diagnose superficial abscesses.
• Imaging studies are used for deeper abscesses.
  • MRI:
    • Superior soft tissue Soft Tissue Soft Tissue Abscess resolution
    • Able to detect associated fistulas, including internal and external openings, with more accuracy than CT
    • Structural damage to sphincters also detected
  • CT scan with IV contrast (and rectal contrast, when able):
    • Structures surrounding the bowel are evaluated.
    • Able to differentiate an abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease from cellulitis Cellulitis Cellulitis is a common infection caused by bacteria that affects the dermis and subcutaneous tissue of the skin. It is frequently caused by Staphylococcus aureus and Streptococcus pyogenes. The skin infection presents as an erythematous and edematous area with warmth and tenderness. Cellulitis
    • An associated fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula may be seen as a track from the bowel traced by the contrast, although resolution may be limited.
    • Small abscesses can be missed in immunocompromised immunocompromised A human or animal whose immunologic mechanism is deficient because of an immunodeficiency disorder or other disease or as the result of the administration of immunosuppressive drugs or radiation. Gastroenteritis individuals.
  • Ultrasonography:
    • Endoscopic US and transrectal US are able to visualize anal sphincters and surrounding structures, as well as determine the abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease size and dimensions.
    • Use of hydrogen peroxide Hydrogen peroxide A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials. Myeloperoxidase Deficiency as the contrast medium helps in detecting fistulas (which would be seen as echo-rich bubbles in a track).
    • Transperineal US is a less invasive technique

Management and Complications

Overview of surgical drainage^{[1,2,4–6,8]}

• Standard of care Standard of care The minimum acceptable patient care, based on statutes, court decisions, policies, or professional guidelines. Malpractice
• All anorectal abscesses should be drained promptly.
• A simple, perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease can be drained in an office or ED.
• Complex perirectal abscesses require drainage in an OR.

Treatment principles^{[2,5,8,9,12,14,15]}

Note: The following surgical principles are based on practices in the United States. Specific recommendations may vary based on practice location (see article on UK and European management).

• Incision and drainage Incision And Drainage Chalazion:
  • Incision is kept close to the anal verge to reduce the length of possible fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula.
  • Wound packing:
    • The practice of packing the wound cavity is common.
    • However, studies have shown that unpacked wounds are associated with less postoperative pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways.
    • There was no difference in healing time and rate of abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease recurrence between packed and unpacked wounds.
  • A stab incision followed by insertion of a small catheter is a less common technique used in perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease.
    • When the drainage stops, the catheter is removed.
    • A drawback of this technique is that loculations are not disrupted.
• Concomitant fistulotomy Fistulotomy Anal Fistula:
  • Up to 70% of cases of anorectal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease are associated with a fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula.
  • Fistulotomy Fistulotomy Anal Fistula (unroofing the fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula tract) for simple superficial fistulas concomitant with abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease management is associated with:
    • ↓ Abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease recurrence
    • ↓ Persistence of abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease or fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula
    • ↓ Need for subsequent surgery
    • ↑ Incontinence
  • When a simple fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula is present:
    • Consider the risk of incontinence in the individual.
    • A draining seton (a suture or elastic Elastic Connective Tissue: Histology band left in the fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula) is also an option.
  • If the internal opening is not apparent or the fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula appears complex or involves a significant portion of the sphincter muscle, treatment should be delayed.
• Wound cultures are obtained in the following settings:
  • Use of antibiotics
  • High risk of antibiotic resistance Resistance Physiologically, the opposition to flow of air caused by the forces of friction. As a part of pulmonary function testing, it is the ratio of driving pressure to the rate of air flow. Ventilation: Mechanics of Breathing (such as in those with multiple courses of antibiotics)
  • Immunocompromised immunocompromised A human or animal whose immunologic mechanism is deficient because of an immunodeficiency disorder or other disease or as the result of the administration of immunosuppressive drugs or radiation. Gastroenteritis state
  • Differentiating a cryptoglandular abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease (from a colonic source) from a skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease (often due to Staphylococcus Staphylococcus Staphylococcus is a medically important genera of Gram-positive, aerobic cocci. These bacteria form clusters resembling grapes on culture plates. Staphylococci are ubiquitous for humans, and many strains compose the normal skin flora. Staphylococcus spp.)
  • In those at risk for MRSA MRSA A strain of Staphylococcus aureus that is non-susceptible to the action of methicillin. The mechanism of resistance usually involves modification of normal or the presence of acquired penicillin binding proteins. Staphylococcus
• Recurrence occurs in 44% of cases, with risk increased with:
  • Inadequate drainage
  • Horseshoe abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
  • Loculations
  • Failure to perform a fistulotomy Fistulotomy Anal Fistula

Antibiotic therapy^[2,9,13]

• Options:
  • Amoxicillin Amoxicillin A broad-spectrum semisynthetic antibiotic similar to ampicillin except that its resistance to gastric acid permits higher serum levels with oral administration. Penicillins–clavulanate
  • Ciprofloxacin Ciprofloxacin A broad-spectrum antimicrobial carboxyfluoroquinoline. Fluoroquinolones plus metronidazole Metronidazole A nitroimidazole used to treat amebiasis; vaginitis; trichomonas infections; giardiasis; anaerobic bacteria; and treponemal infections. Pyogenic Liver Abscess
• Indications (according to the American Society of Colon Colon The large intestines constitute the last portion of the digestive system. The large intestine consists of the cecum, appendix, colon (with ascending, transverse, descending, and sigmoid segments), rectum, and anal canal. The primary function of the colon is to remove water and compact the stool prior to expulsion from the body via the rectum and anal canal. Colon, Cecum, and Appendix: Anatomy and Rectal Surgeons (ASCRS)):
  • Extensive cellulitis Cellulitis Cellulitis is a common infection caused by bacteria that affects the dermis and subcutaneous tissue of the skin. It is frequently caused by Staphylococcus aureus and Streptococcus pyogenes. The skin infection presents as an erythematous and edematous area with warmth and tenderness. Cellulitis
  • Signs of sepsis Sepsis Systemic inflammatory response syndrome with a proven or suspected infectious etiology. When sepsis is associated with organ dysfunction distant from the site of infection, it is called severe sepsis. When sepsis is accompanied by hypotension despite adequate fluid infusion, it is called septic shock. Sepsis and Septic Shock
  • Valvular heart disease
  • Immunosuppression
  • Diagnostic approach Diabetes Diabetes Diabetes mellitus (DM) is a metabolic disease characterized by hyperglycemia and dysfunction of the regulation of glucose metabolism by insulin. Type 1 DM is diagnosed mostly in children and young adults as the result of autoimmune destruction of β cells in the pancreas and the resulting lack of insulin. Type 2 DM has a significant association with obesity and is characterized by insulin resistance. Diabetes Mellitus 
• The American Journal of Surgery released a study in 2019 that stands in contrast to the ASCRS recommendations:
  • Empiric antibiotic therapy is associated with reduced risk of fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula formation.
  • In some practices, empiric antibiotics are administered to all individuals after incision and drainage Incision And Drainage Chalazion.

Specific surgical approaches^[2,8]

• Perianal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease (most common):
  • Drained through skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions incision
  • Performed under local anesthesia Anesthesia A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures. Anesthesiology: History and Basic Concepts in an outpatient setting or in the emergency department
  • A cruciate incision is made near the anal verge, and purulent contents are evacuated.
  • The cavity is irrigated with sterile Sterile Basic Procedures saline.
  • No wound packing is needed.
• Ischiorectal Ischiorectal Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
  • Drained through skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions incision
  • Under local anesthesia Anesthesia A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures. Anesthesiology: History and Basic Concepts, a cruciate incision is made near the sphincter complex, and pus is evacuated from the cavity.
  • Cavity is irrigated with sterile Sterile Basic Procedures saline.
  • No wound packing is needed.
• Intersphincteric Intersphincteric Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
  • Drained into the rectum Rectum The rectum and anal canal are the most terminal parts of the lower GI tract/large intestine that form a functional unit and control defecation. Fecal continence is maintained by several important anatomic structures including rectal folds, anal valves, the sling-like puborectalis muscle, and internal and external anal sphincters. Rectum and Anal Canal: Anatomy (via an internal sphincterotomy Sphincterotomy Surgical incision of a sphincter. Anal Fissure, usually posterior)
  • Under anesthesia Anesthesia A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures. Anesthesiology: History and Basic Concepts, the abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease is visualized by placing a retractor in the anal canal.
  • The incision is made below the dentate line Dentate line Rectum and Anal Canal: Anatomy.
  • The internal sphincter muscle is divided up to the level of the dentate line Dentate line Rectum and Anal Canal: Anatomy and the abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease is deroofed.
  • With the cavity left open, no wound packing is needed.
  • Healing can take up to 4 weeks.
• Supralevator Supralevator Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
  • An abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease secondary to the upward extension Extension Examination of the Upper Limbs of an intersphincteric Intersphincteric Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
    • Drainage is through the rectum Rectum The rectum and anal canal are the most terminal parts of the lower GI tract/large intestine that form a functional unit and control defecation. Fecal continence is maintained by several important anatomic structures including rectal folds, anal valves, the sling-like puborectalis muscle, and internal and external anal sphincters. Rectum and Anal Canal: Anatomy.
    • If drained through the ischiorectal Ischiorectal Perianal and Perirectal Abscess fossa, a suprasphincteric fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula may result.
  • If the abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease arises from an ischiorectal Ischiorectal Perianal and Perirectal Abscess abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
    • Drainage is through the ischiorectal Ischiorectal Perianal and Perirectal Abscess fossa.
    • If drained through the rectum Rectum The rectum and anal canal are the most terminal parts of the lower GI tract/large intestine that form a functional unit and control defecation. Fecal continence is maintained by several important anatomic structures including rectal folds, anal valves, the sling-like puborectalis muscle, and internal and external anal sphincters. Rectum and Anal Canal: Anatomy, an extrasphincteric fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula may result.
• Horseshoe abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease:
  • Drainage of the deep postanal space is needed.
  • The anococcygeal ligament is incised, draining the posterior anal infection.
  • Counterdrainage incisions are made on each extension Extension Examination of the Upper Limbs/limb of the abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease.

Postoperative care Postoperative care After any procedure performed in the operating room, all patients must undergo close observation at least in the recovery room. After larger procedures and for patients who require hospitalization, observation must continue on the surgical ward. The primary intent of this practice is the early detection of postoperative complications. Postoperative Care: ^[2,4,5,8]

• Keep incision site clean.
• Analgesics
• Stool softeners
• Sitz baths

Complications^[2,4,5,8]

• Sepsis Sepsis Systemic inflammatory response syndrome with a proven or suspected infectious etiology. When sepsis is associated with organ dysfunction distant from the site of infection, it is called severe sepsis. When sepsis is accompanied by hypotension despite adequate fluid infusion, it is called septic shock. Sepsis and Septic Shock
• Recurrent abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease
• Fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula formation
• Urinary retention Urinary retention Inability to empty the urinary bladder with voiding (urination). Delirium
• Constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation or incontinence
• Fournier gangrene Fournier gangrene An acute necrotic infection of the scrotum; penis; or perineum. It is characterized by scrotum pain and redness with rapid progression to gangrene and sloughing of tissue. Fournier gangrene is usually secondary to perirectal or periurethral infections associated with local trauma, operative procedures, or urinary tract disease. Necrotizing Fasciitis:
  • Necrotizing fasciitis Necrotizing fasciitis Necrotizing fasciitis is a life-threatening infection that causes rapid destruction and necrosis of the fascia and subcutaneous tissues. Patients may present with significant pain out of proportion to the presenting symptoms and rapidly progressive erythema of the affected area. Necrotizing Fasciitis of the external genitalia, perineal, or perianal area
  • Associated with a high rate of mortality Mortality All deaths reported in a given population. Measures of Health Status

Diagnostic and management checklist

• Clinical presentation:
  • Anal or rectal pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways
  • Other associated symptoms: urinary retention Urinary retention Inability to empty the urinary bladder with voiding (urination). Delirium, fever Fever Fever is defined as a measured body temperature of at least 38°C (100.4°F). Fever is caused by circulating endogenous and/or exogenous pyrogens that increase levels of prostaglandin E2 in the hypothalamus. Fever is commonly associated with chills, rigors, sweating, and flushing of the skin. Fever, sepsis Sepsis Systemic inflammatory response syndrome with a proven or suspected infectious etiology. When sepsis is associated with organ dysfunction distant from the site of infection, it is called severe sepsis. When sepsis is accompanied by hypotension despite adequate fluid infusion, it is called septic shock. Sepsis and Septic Shock
• Examination:
  • Inspection Inspection Dermatologic Examination of anal and perianal area
  • Digital rectal examination Digital Rectal Examination A physical examination in which the qualified health care worker inserts a lubricated, gloved finger of one hand into the rectum and may use the other hand to press on the lower abdomen or pelvic area to palpate for abnormalities in the lower rectum, and nearby organs or tissues. The method is commonly used to check the lower rectum, the prostate gland in men, and the uterus and ovaries in women. Prostate Cancer Screening
  • If there are no external signs and suspicion for deep abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease is high, proceed with imaging.
• Imaging options
  • CT or MRI (Note: CT is more readily available than MRI.)
  • Endoanal US
• Management
  • Surgical consult
  • Determine the type of abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease and whether a fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula is present.
  • Incision and drainage Incision And Drainage Chalazion (determined by the type of abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease)
  • Determine whether fistulotomy Fistulotomy Anal Fistula is required.
  • Antibiotics
  • Postoperative care Postoperative care After any procedure performed in the operating room, all patients must undergo close observation at least in the recovery room. After larger procedures and for patients who require hospitalization, observation must continue on the surgical ward. The primary intent of this practice is the early detection of postoperative complications. Postoperative Care

Differential Diagnosis

• Anal fissure Fissure A crack or split that extends into the dermis Generalized and Localized Rashes: a superficial tear in the anoderm associated with constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, trauma, or inflammatory bowel disease: Patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship present with rectal pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways during bowel movements, passage of bright red blood, and anal spasm. The diagnosis is clinical. Management is usually conservative and includes increasing fluid and fiber intake, warm sitz baths, and stool softeners. Topical nifedipine Nifedipine A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure. Class 4 Antiarrhythmic Drugs (Calcium Channel Blockers) or nitroglycerin Nitroglycerin A volatile vasodilator which relieves angina pectoris by stimulating guanylate cyclase and lowering cytosolic calcium. It is also sometimes used for tocolysis and explosives. Nitrates helps with anal spasms Spasms An involuntary contraction of a muscle or group of muscles. Spasms may involve skeletal muscle or smooth muscle. Ion Channel Myopathy, and local anesthetics Anesthetics Agents that are capable of inducing a total or partial loss of sensation, especially tactile sensation and pain. They may act to induce general anesthesia, in which an unconscious state is achieved, or may act locally to induce numbness or lack of sensation at a targeted site. Anesthesiology: History and Basic Concepts provide pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways control.  
• Anal fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula: abnormal communications between the anorectal lumen and another body structure, often to the skin Skin The skin, also referred to as the integumentary system, is the largest organ of the body. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue. Skin: Structure and Functions: Anal fistula Fistula Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body. Anal Fistula can occur because of extension Extension Examination of the Upper Limbs of an anal abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease. Symptoms include pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways and abnormal discharge. The diagnosis is clinical. Management is primarily surgical ( fistulotomy Fistulotomy Anal Fistula) but can include antibiotics if infection is present.
• Hemorrhoids Hemorrhoids Hemorrhoids are normal vascular cushions in the anal canal composed of dilated vascular tissue, smooth muscle, and connective tissue. They do not cause issues unless they are enlarged, inflamed, thrombosed, or prolapsed. Patients often present with rectal bleeding of bright red blood, or they may have pain, perianal pruritus, or a palpable mass. Hemorrhoids: dilated vessels of the hemorrhoidal plexus in the anal canal, commonly caused by constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation: Depending on the location of the veins Veins Veins are tubular collections of cells, which transport deoxygenated blood and waste from the capillary beds back to the heart. Veins are classified into 3 types: small veins/venules, medium veins, and large veins. Each type contains 3 primary layers: tunica intima, tunica media, and tunica adventitia. Veins: Histology, hemorrhoids Hemorrhoids Hemorrhoids are normal vascular cushions in the anal canal composed of dilated vascular tissue, smooth muscle, and connective tissue. They do not cause issues unless they are enlarged, inflamed, thrombosed, or prolapsed. Patients often present with rectal bleeding of bright red blood, or they may have pain, perianal pruritus, or a palpable mass. Hemorrhoids can be internal or external. External hemorrhoids Hemorrhoids Hemorrhoids are normal vascular cushions in the anal canal composed of dilated vascular tissue, smooth muscle, and connective tissue. They do not cause issues unless they are enlarged, inflamed, thrombosed, or prolapsed. Patients often present with rectal bleeding of bright red blood, or they may have pain, perianal pruritus, or a palpable mass. Hemorrhoids are painful, whereas internal hemorrhoids Hemorrhoids Hemorrhoids are normal vascular cushions in the anal canal composed of dilated vascular tissue, smooth muscle, and connective tissue. They do not cause issues unless they are enlarged, inflamed, thrombosed, or prolapsed. Patients often present with rectal bleeding of bright red blood, or they may have pain, perianal pruritus, or a palpable mass. Hemorrhoids are painless. Both types can bleed and appear as a soft rectal mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast on exam. The diagnosis is clinical. Management includes stool softeners, topical hydrocortisone Hydrocortisone The main glucocorticoid secreted by the adrenal cortex. Its synthetic counterpart is used, either as an injection or topically, in the treatment of inflammation, allergy, collagen diseases, asthma, adrenocortical deficiency, shock, and some neoplastic conditions. Immunosuppressants, and sitz baths. Additional treatment options are rubber band ligation Band ligation Mallory-Weiss Syndrome (Mallory-Weiss Tear) or surgical removal.  
• Pilonidal cyst: can present as an abscess Abscess Accumulation of purulent material in tissues, organs, or circumscribed spaces, usually associated with signs of infection. Chronic Granulomatous Disease: Like perianal abscesses, pilonidal cysts Cysts Any fluid-filled closed cavity or sac that is lined by an epithelium. Cysts can be of normal, abnormal, non-neoplastic, or neoplastic tissues. Fibrocystic Change present with erythema Erythema Redness of the skin produced by congestion of the capillaries. This condition may result from a variety of disease processes. Chalazion, tenderness, and swelling Swelling Inflammation. However, pilonidal abscesses occur in the intergluteal area superior and dorsal to the anus. These cysts Cysts Any fluid-filled closed cavity or sac that is lined by an epithelium. Cysts can be of normal, abnormal, non-neoplastic, or neoplastic tissues. Fibrocystic Change are diagnosed by physical examination and are treated by surgical incision and drainage Incision And Drainage Chalazion.  
• Anal carcinoma: neoplastic disease in which cancer cells form and grow in the anus: Risk factors include older age, infections Infections Invasion of the host organism by microorganisms or their toxins or by parasites that can cause pathological conditions or diseases. Chronic Granulomatous Disease such as HPV HPV Human papillomavirus (HPV) is a nonenveloped, circular, double-stranded DNA virus belonging to the Papillomaviridae family. Humans are the only reservoir, and transmission occurs through close skin-to-skin or sexual contact. Human papillomaviruses infect basal epithelial cells and can affect cell-regulatory proteins to result in cell proliferation. Papillomavirus (HPV), multiple sexual partners, and anal sex Sex The totality of characteristics of reproductive structure, functions, phenotype, and genotype, differentiating the male from the female organism. Gender Dysphoria. Symptoms include bleeding from the anus, anal pain Pain An unpleasant sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Pain: Types and Pathways, anal mass Mass Three-dimensional lesion that occupies a space within the breast Imaging of the Breast, or itching. Anal carcinoma is diagnosed by biopsy Biopsy Removal and pathologic examination of specimens from the living body. Ewing Sarcoma. Management can include surgery, radiation Radiation Emission or propagation of acoustic waves (sound), electromagnetic energy waves (such as light; radio waves; gamma rays; or x-rays), or a stream of subatomic particles (such as electrons; neutrons; protons; or alpha particles). Osteosarcoma, or chemotherapy Chemotherapy Osteosarcoma.