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Oncocytoma : Perinephric Fat Infiltration

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Comments:
Focal extension into perinephric fat is seen in about 20% of renal oncocytomas. There is no desmoplastic response. The presence of this feature does not impact pathologic staging. In less than 5% of cases, vascular invasion is seen. In an otherwise typical oncocytoma, this feature does not carry any clinical significance.

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