Diard F, Eklöf O, Lebowitz R, Maurseth K
Pediatr Radiol. 1981;11(3):139-42. doi: 10.1007/BF00971815.
Four boys, each with urethral obstruction caused by a prolapsed simple ureterocele (from a non-duplicated collecting system) are reported. This is an unusual complication of an uncommon anomaly.