title: Urethral calculi in three Nigerian males.
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008875:Middle Aged; D009549:Nigeria; D011859:Radiography; D012737:Sex Factors; D014522:Urethral Diseases / Q000000981:diagnostic imaging* / Q000453:epidemiology; D014545:Urinary Calculi / Q000000981:diagnostic imaging* / Q000453:epidemiology