en عمومى General گزارش مورد 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. Oncocytoma, kidney, tumor 266 268 http://intjmi.com/browse.php?a_code=A-10-1-91&slc_lang=en&sid=1 Sameer Alshayyab 10031947532846002478 10031947532846002478 Yes Renal Division, Department of Medicine, King Hussein Medical City, Amman Jordan Ayham haddad 10031947532846002479 10031947532846002479 No Head of Renal Division, Department of Medicine, King Hussein Medical City, Amman Jordan Hussein Alshebli 10031947532846002480 10031947532846002480 No Renal Division, Department of Medicine, King Hussein Medical City, Amman Jordan Lina Alnahr 10031947532846002481 10031947532846002481 No Department of Pathology, King Hussein Medical City, Amman Jordan Mohammad Abd Alfattah Alserhan 10031947532846002482 10031947532846002482 No Department of Urology, King Hussein Medical City, Amman Jordan