A large extra-abdominal prevesical pseudo-cyst in a newborn with posterior urethral valves.

A male newborn is described, in whom a large extra-abdominal prevesical pseudo-cyst as well as prune-belly features were present, both of which were supposedly secondary to posterior urethral valves. It is postulated that the subvesical obstruction caused pressure build-up in the urinary tract, followed by fetal bladder rupture. The resultant urinoma migrated extra-abdominally. Distension of the urinary tract, bilateral cryptorchidism and abdominal wall laxity contributed to a prune-belly phenotype.