The atonic distal ureteral segment (ureteral achalasia).
D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D014515:Ureteral Diseases / Q000000981:diagnostic imaging / Q000601:surgery; D014546:Urinary Catheterization