From which of the following renal oncocytoma arises ?: (A) Loop of henle, (B) Collecting duct, (C) Proximal tubule, (D) Bowman's capsule
Answer is B. RENAL ONCOCYTOMA: Benign epithelial neoplasm Arises from the intercalated cells of collecting ducts. Associated with genetic changes : loss of chromosomes 1 and Y Gross appearance- tumors are tan colored ,relatively homogeneous, and well encapsulated with central stellate scar Microscopically- characterized by a plethora of mitochondria which gives them tan color and granular eosinophilic cytoplasm.