Nephrogenic adenoma of the ureter: Case report S.U. Bozkurt 1 , _ I. Erbarut 1 , C. Yazıcı 2 , H. Kaya 1 & L. Tu¨rkeri 2 1 Department of Pathology,Hospitalof the University ofMarmara, _ I stanbul, Turkey; 2 Department of Urology, Hospital of the University of Marmara, _ Istanbul, Turkey Abstract.Nephrogenic adenoma is a rare metaplastic benign lesion of urothelium in response to genit urinary tract procedures, chronic infection, trauma, urinary calculi and immunosuppressive therapy a renal transplantation. It has been reported to occur throughout the urinary tract especially, in the ur bladder.We report a case of nephrogenic adenoma arising from the lower end of the right ureter with clinical and radiological features suspicious of carcinoma. Key words:Immunohistochemistry, Nephrogenic adenoma, Nephrogenic metaplasia, Ureter Introduction Nephrogenic adenoma is a rare benign metaplastic lesion of the urothelium. Although this lesion oc- curs most commonly in the urinary bladder, it has been described throughout the urinary tract [1]. The first case was reported by Davis [2] as a ‘hamartoma in the urinary bladder. Then this lesion was named as ‘nephrogenic adenoma’ by Friedman and Kub- lenbeck [3] due to similarity to the renal tubules. Figure 1.CT scan showing suspicious mass of approximately 1 cm in size as a small filling defect (arrow) at the level of right ur orifice. International Urology and Nephrology (2007) 39:65–69 Ó Springer 2007 DOI 10.1007/s11255-005-4029-0