title: Ureteropelvic junction obstruction.
abstract: Physicians sometimes forget nongastrointestinal causes of abdominal pain. Yet, abdominal pain was the major complaint of three patients with ureteropelvic junction obstruction (UPJ). Definitive diagnosis can be made either by a "hydration" intravenous pyelogram or by an intravenous pyelogram during an attack.
mesh_terms: D000005:Abdomen; D000328:Adult; D000428:Alcohol Drinking; D002648:Child; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis*; D007682:Kidney Pelvis / Q000473:pathology; D008297:Male; D010146:Pain / Q000209:etiology*; D014463:Ultrasonography; D014517:Ureteral Obstruction / Q000175:diagnosis*; D014567:Urography