"OchronosisPTNCI" . "C84938"^^ . "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.NCI" . "Ochronosis"^^ . . . "Ochronosis"^^ . "Disease or Syndrome"^^ . "C0028817"^^ . .