Oncocytoma pathophysiology

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Oncocytoma Microchapters
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Overview
Historical Perspective
Pathophysiology
Causes
Differentiating Oncocytoma from other Diseases
Epidemiology and Demographics
Risk Factors
Natural History, Complications and Prognosis
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Case #1
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Overview

This is an epithelial tumor composed of large, eosinophilic cells having small, round, benign-appearing nuclei that have large nucleoli. It is thought to arise from the intercalated cells of collecting ducts. It is not an uncommon tumor, accounting for approximately 5% to 15% of surgically resected renal neoplasms. Ultrastructurally, the eosinophilic cells have numerous mitochondria. In gross appearance, the tumors are tan or mahogany brown, relatively homogeneous, and usually well encapsulated. However, they may achieve a large size (up to 12 cm in diameter). Although anecdotal cases with metastases have been reported, the tumor is considered benign. There are some familial cases in which these tumors are multicentric rather than solitary.