A Case of Left Duplex Kidney with Hydronephrosis Mimicking a Left Renal Cyst in a 29-Year-Old Woman.

The American Journal of Case Reports
Chung-Tso Chen, Shih-Feng Wang

Abstract

BACKGROUND Duplex kidney, also known as duplex renal collecting system, consists of 2 ureters arising from a single kidney and is a common congenital anomaly. The condition is usually an asymptomatic normal variant. However, abnormal anatomic variants such as hydronephrosis, vesicoureteral reflux (VUR), and ureterocele are sometimes observed in a patient with a duplicated kidney. These abnormal variants usually lead to diagnostic challenges. Here, we report a case of congenital left duplex kidney with hydronephrosis that presented as an isolated left renal cyst in a 29-year-old woman. CASE REPORT We present the case of a 29-year-old woman who had left-side abdominal pain and fever for 1 day. Left-side flank throbbing pain was also noted. Laboratory investigations showed leukocytosis, pyuria and bacteriuria. Renal ultrasound revealed a huge hypoechoic mass around the left kidney, which was suspected to be a huge renal cyst or renal abscess. Under the impression of acute pyelonephritis with abscess formation, the patient was admitted for antibiotic treatment. The following abdominal computed tomography (CT) revealed a left duplex kidney with severe hydronephrosis and hydroureter. A percutaneous nephrostomy was then performed. Nex...Continue Reading

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