system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Oncocytic carcinoma arises from
assistant
The correct answer is  Refer Robbins 8/e p964, 9/ep953 Oncocytoma This is an epithelial neoplasm 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, and accounts for approximately 5% to 15% of renal neoplasms. Ultra-structurally the eosinophilic cells have numerous mitochondria. In gross appearance, the tumors are tan or mahogany brown, relatively homogeneous, and usually well encapsulated with a central scar in one-third of cases. However, they may achieve a large size (up to 12 cm in diameter). There are some familial cases in which these tumors are multicentric rather than solitary.