title: [Alkaptonuria (ochronosis)].
abstract: A 39-year-old male patient observed an increasing bluish pigmentation of the ear cartilage associated with recurrent back-pain. Darkening of the urine after the addition of sodium hydroxide led to the suspected diagnosis of alkaptonuria. This diagnosis was confirmed by the detection of urinary homogentisic acid by thin-layer chromatography.
mesh_terms: D000328:Adult; D000474:Alkaptonuria / Q000175:diagnosis* / Q000473:pathology; D004425:Ear Cartilage / Q000473:pathology; D006801:Humans; D008297:Male; D009794:Ochronosis / Q000175:diagnosis / Q000473:pathology; D012590:Sclera / Q000473:pathology
vernacular_title: Alkaptonurie (Ochronose).