Squamous papilloma of the renal pelvis mimicking transitional cell carcinoma.

Squamous papilloma of the renal pelvis is an extremely rare entity. To the best of our knowledge, no case has been reported till date. A 45-year-old female presented to us with flank pain for two months. She had undergone left-sided percutaneous nephrolithotomy three years ago. Preoperative evaluation suggested the presence of a transitional cell tumor arising from the left renal pelvis. Diethylene-triamine-pentaacetic acid renogram showed a non-functional left kidney. She underwent left nephroureterectomy. Histopathology showed squamous papilloma of the renal pelvis. Subsequent follow-ups have been uneventful.