title: Sonographic diagnosis of an obstructing urethral calculus.
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D011859:Radiography; D014463:Ultrasonography; D014521:Urethra / Q000000981:diagnostic imaging / Q000473:pathology; D014524:Urethral Obstruction / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology*; D014545:Urinary Calculi / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging