Background Ochronosis/Alkaptonuria is a tyrosine metabolism disorder where accumulation of homogentisic acid, in eye, skin, cartilage and several other connective tissues leads to a black ...

The patient then stated that he had already been given the diagnosis of ochronosis 30 years earlier ... and “dark cartilage destruction,” which may be visible in the external ear.

The patient then stated that he had already been given the diagnosis of ochronosis 30 years earlier ... and “dark cartilage destruction,” which may be visible in the external ear.