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.
 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.
Patient #1: PET/CT images demonstrate a large right renal oncocytoma
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 References for Oncocytoma
- J Laperriere, and M Lafortune. Case of the day. General. Oncocytoma of the right kidney. RadioGraphics 1990 10: 1105-1107.