Abstract
A 73-year-old woman visited our clinic for right abdominal fullness and dull pain. She had been treated rheumatoid arthritis and CT scan had shown hydronephrosis with a renal stone in the right kidney of horseshoe kidney 2 and a half years ago, although no treatment had been sought because of the lack of symptoms. Although retrograde pyelography showed no filling defect in the upper urinary tract, urine cytology was positive. Subsequent ureteroscopy of the right renal pelvis showed multiple papillary tumors. Right nephroureterectomy and isthmusectomy were performed. The pathological diagnoses were urothelial carcinoma in the renal pelvis and squamous cell carcinoma, accompanied by urothelial carcinoma in the ureter. The present report describes the 35th case of renal pelvic carcinoma occurred in a horseshoe kidney in Japan.
