Oncocytoma

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[edit] Discussion of Oncocytoma

  • Renal oncocytomas are relatively rare, benign tumors (3%-6% of all renal neoplasms).
  • Usually present in the 6th or 7th decade of life and usually have no symptoms
  • Large tumors frequently have a central scar. This scar is seen on CT scans and sonograms in about one-third of cases.
  • Renal oncocytomas exhibit homogeneous enhancement on CT scans, and one-half of them have a radiating arterial anrangment on angiograms.
  • The main differential diagnosis for renal oncocytoma is renal cell carcinoma. Oncocytoma and renal cell carcinoma can not be accurately differentiated by imaging.

[edit] Imaging Findings for Oncocytoma

  • The presence of a central scar in an otherwise homogeneous solid tumor on CT or ultrasound suggests oncocytoma.
  • The presence of a spoke wheel pattern of enhancement also suggests oncocytoma.

[edit] Images

Patient #1: PET/CT images demonstrate a large right renal oncocytoma

[edit] See Also

[edit] External Links

[edit] References for Oncocytoma