Renal oncocytoma

Overview
Renal oncocytomas are relatively rare, and 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.

Diagnostic Findings
Renal oncocytomas exhibit homogeneous enhancement on CT scans, and one-half of them have a radiating arterial arrangement on angiograms.


 * 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 an oncocytoma.

(Images courtesy of RadsWiki)

Differential Diagnosis
The main differential diagnosis for renal oncocytoma is renal cell carcinoma. Oncocytoma and renal cell carcinoma can not be accurately differentiated by imaging.