Congenital Giant Megaureter in a Sixteen-Year-Old Female Presenting with Abdominal Pain: A Case Report and Review of Literature.

We describe a case of congenital giant megaureter (CGM) in a sixteen-year-old female. She presented with a five-day history of abdominal distention, right flank pain and tenderness. Right pyelonephritis was suspected. Computerized tomography (CT) showed a large cystic abdominal mass with no appreciably functioning left kidney causing secondary compression of the contralateral right ureter. A left upper nephroureterectomy was performed, draining over 3.5 L of fluid. Our experience suggests that CGM should be considered in the differential for pediatric patients presenting with a cystic abdominal mass.