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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