Constitutes 6-9% of renal cortical neoplasms.

Benign lesions that are characterized by eosinophilic cytoplasm with tumor cells arranged in nests, cords, or tubules but do not exhibit a papillary growth pattern.

Never associated with mitotic activity or tumor necrosis.

Majority of cases act benignly and only a few cases of metastases reported.

Commonly exhibit loss of Y and 1 chromosome and rarely have a translocation of chromosome 11. It

It is the most common tomorrow that mimics renal cancer.

On imaging it is typically homogeneous and includes the classic central scar that correlates histlogically with fibrosis.

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