[Ureteral polyp occurring as renal dysfunction with contralateral ureteral calculi: a case report].

A 46-year-old man was admitted to our hospital complaining of macroscopic hematuria with dull pain in the right flank. Laboratory finding showed renal dysfunction and abdominal ultrasound sonograph revealed bilateral hydronephrosis (right > left). Retrograde pyelography showed left ureteral calculi and a filling defect in the middle portion of the right ureter. Renal function improved after bilateral single-J ureteral stent placement. Selective wash cytology of right renal pelvis was class II. Ureteroscopy demonstrated right ureteral obstruction with smooth-surfaced protruded tumor and cold cup biopsy was performed. Histopathological diagnosis was a fibroepithelial polyp but with no malignancy. In addition, left transurethral lithotripsy was performed under ureteroscopy. After the endoscopic examination, a double pigtail stent inserted into the right ureter. We performed conservative management by repeat urine cytologies and retrograde pyelography due to thrombocytopenia. The urine cytologies all proved negative and retrograde pyelography showed no abnormal changes. A ureteroscopic procedure is considered to be useful for the diagnosis of ureteral polyps. Transurethral resection of ureteral polyps with a ureteroscope is recommended for treatment.