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.


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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