title: Clinical Quiz. A 69-year-old man with a thick dark pigmentation on his hands, and low back pain.
authors.affiliation: Respiratory Medicine Division, King Hussein Medical Center, PO Box 2399, Tela'a Al-Ali, Amman 11953, Jordan. helkhushman@hotmail.com
authors.forename: Haytham M
authors.initials: HM
authors.lastname: El-Khushman
mesh_terms: D000368:Aged; D000474:Alkaptonuria / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D003937:Diagnosis, Differential; D005260:Female; D006229:Hand Dermatoses / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D017116:Low Back Pain / Q000209:etiology*; D009794:Ochronosis / Q000175:diagnosis / Q000209:etiology*