International Urology and Nephrology 24 (4), pp. 345-- 346 (1992)

Inverted Papilloma of the Renal Pelvis G. VLASSOPOULOS,G. SAKKAS, S. LEGAKI, F. SOFRAS,A. KARAGIANN1S Academic Urology Unit, University of Athens, Sismanoglion Hospital, Maroussi, Athens, Greece (Accepted September 5, 1991) The authors describe a case of inverted papilloma. It is relatively rare and generally appears as a benign tumour.

Introduction Inverted papilloma of the urinary tract, initially reported as "adenoma" by Paschkis [1 ] and later described by Potts and Hirst [2] is a well-recognized tumour, generally considered as benign, although some reports suggest that it may have malignant potential [3]. It is a relatively rare tumour with less than 200 cases reported in the literature and it is usually found in the bladder. In the renal pelvis it is even rarer with only 13 cases reported by 1989.

Case report A 59-year-old Caucasian male was admitted to our unit with haematuria and pain in the left loin. Haematological and biochemical screening was normal. IVU showed a filling defect of the left renal pelvis, and retrograde ureterography confirmed the finding. Urine cytology was normal. CT scan showed a spaceoccupying lesion of the pelvis without extension to perirenal tissues, enlarged lymph nodes or involvement of other intra-abdominal organs (Fig. 1). With the preoperative diagnosis of transitional cell tumour of the renal pelvis the patient was subjected to left nephroureterectomy. The postoperative course was uneventful and the patient was discharged 10 days later. Histology showed a 2 cm polypoid, non-pedunculated area with microscopic findings corresponding to those of an inverted papilloma (Fig. 2). Follow-up with cytology and cystoscopy has been negative 12 months later.

Discussion Inverted papilloma of the renal pelvis is a rare tumour that is almost always diagnosed postoperatively. Its histological characteristics have been well documented and although it is benign, there are reports suggesting that a malignant change VSP, Utrecht Akaddmiai Kiad6, Budapest

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Vlassopoulos et al.. Inverted papilloma

Fig. 1

Fig. 2 m a y occur. The m a i n s y m p t o m is h a e m a t u r i a a n d r a d i o l o g y will establish the diagnosis o f a t r a n s i t i o n a l cell t u m o u r o f the u p p e r tract. N o recurrence o f the t u m o u r following n e p h r o u r e t e r e c t o m y has occurred in a n y o f the r e p o r t e d cases.

References 1. Paschkis, R. : lJber Adenome der Harnblase. Z. Urol. Chir., 21, 315 (1927). 2. Potts, I., Hirst, E. : Inverted papilloma of the bladder. J. Urol., 90, 175 (1963). 3. Takeshi, U., Shoosuke, M. : Inverted papilloma with malignant change of the renal pelvis. Urology, 17, 200 (1981). International Urology and Nephrology 24, 1.992

Inverted papilloma of the renal pelvis.

The authors describe a case of inverted papilloma. It is relatively rare and generally appears as a benign tumour...
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