oncocytoma , very rare tumor in the kidney. case report

Renal oncocytomas (ro) are benign rare tumors within intercalated cells of the collecting duct in the kidney, incidence about5 % of all renal tumors. most of these tumors incidentally found on ct scans, it’s commonly seen more in male at age of 40 years, ct criteria’s are poor predictors for proper diagnosis and does not exclude malignant renal cell tumors, case ;50 year male patients presented t with long standing right loin pain on physical examination the patient was in pain and right flank fullness and mass was felt, renal ct scan was done in the hospital and showed 7.5*8.4 cm inhomogeneous enhanced soft tissue mass within right kidney, so renal cell carcinoma was the top of differential diagnosis. so the decision was for right radical nephrectomy. which was done at december 2014? at histopathology report, the cut surface show a tumor with a brown color occupying 60% of the renal tissue still confirmed within the renal capsule grossly. the tumor measured 605 cm in maximal dimension microscopic description was shown a tumor composed of sheets nests and tubules composed of oncocytic polyclonal cells having central nuclei with rare mitotic figures, the final diagnosis of right nephrectomy specimen was consistent with oncocytoma the excision was complete. the patient then was referred to medical oncology clinic at our hospital, it was discussed at multidisciplinary urology clinic, and the decision was to keep this patient on regular follow up.