title: Renal oncocytoma in acquired renal cystic disease.
abstract: Renal oncocytoma is a rare benign tumor of the kidney that accounts for about 5% of renal tumors. Acquired renal cystic disease (ARCD) is commonly seen in dialyzed patients. However, the occurrence of renal oncocytoma in ARCD has rarely been reported. We report such a case in a 67-year-old man who had hypertension-associated end-stage renal disease and had received regular hemodialysis for 5 years. Radiologic diagnostic studies demonstrated a renal mass in the left atrophic cystic kidney that increased in size from 2 cm to 4 cm during 2 years of follow-up. Under the diagnosis of renal cell carcinoma, he received left radical nephrectomy. The pathologic examination revealed renal oncocytoma with a well-cirumscribed, homogenous, mahogany-brown tumor on a background of ARCD. Although patients with ARCD have a higher incidence of renal malignancies, renal oncocytoma may occur in these patients and may be managed conservatively.
authors.affiliation: Departments of Nephrology and Pathology, Kuang Tien General Hospital, Taichung, Taiwan.
authors.forename: T C
authors.initials: TC
authors.lastname: Lu
authors.forename: P S
authors.initials: PS
authors.lastname: Lim
authors.forename: W M
authors.initials: WM
authors.lastname: Hsu
authors.forename: T H
authors.initials: TH
authors.lastname: Wang
authors.forename: S T
authors.initials: ST
authors.lastname: Liu
mesh_terms: D018249:Adenoma, Oxyphilic / Q000209:etiology* / Q000473:pathology; D000368:Aged; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000150:complications*; D007680:Kidney Neoplasms / Q000209:etiology* / Q000473:pathology; D008297:Male