Urinary Tract Cistern as a Rare Cause of Huge Abdominal Cystic Mass in an Infant: A Case Report

Megaureter is defined as a lower-end ureter diameter greater than 7 mm in children. Although often diagnosed antenatally, postnatal presentation can occur with urinary tract infections, abdominal pain, hematuria, or incidentally. We present a rare case of a urinary cistern, which was an ectopic ureter of an aborted left duplicated system, forming a giant abdominal mass and causing contralateral hydroureteronephrosis with bilateral undescended testes.