Renal Oncocytoma

Sagittal contrast-enhanced CT image shows a well defined, enhancing mass in the right kidney of a 67-year-old man presenting with hematuria.

Facts: Renal Oncocytoma

• 5% of all adult primary renal epithelial neoplasm in surgical series
• Believed to originate from or differentiate toward type A intercalated cells of the cortical collecting duct
• Men more common than women
• Frequently seen in 7th decade

Imaging Features

• Solitary, well defined mass of renal cortex
• Stellate fibrotic scar can be seen with large tumors
• Spoke-wheel pattern of feeding arteries seen on catheter angiography
• Cannot be differentiated from renal cell carcinoma, and can be associated with RCCs either as hybrid tumors or collision tumors

Our case: Oncocytoma proven by histology. On imaging, this mass cannot be differentiated from RCC and should be investigated as possible RCC until proven otherwise.

Reference:

Prasad SR, Surabhi VR, Menias CO, et al. Benign renal neoplasms in adults: cross-sectional imaging findings. AJR 2008;190:158-164

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