May 21, 2010

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.

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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