disease has location disease has feature Ochronosis ochronosis disorder https://www.malacards.org/card/ochronosis A disorder characterized by bluish-black discoloration of the cartilaginous tissues due to accumulation of homogentisic acid. It is associated with alkaptonuria. Signs and symptoms include dark urine, skin pigmentation, and arthritis. MONDO:0001910 MESH:D009794 DOID:14223 GARD:0007231 NCIT:C84938 UMLS:C0028817 MEDGEN:45177 ICD9:270.2 HP:0030764 ochronosis SCTID:410042009 connective tissue disorder metabolic disease skeletal system disorder cartilage tissue