To Stage or Not to Stage: Determining the True Clinical Significance of the Biopsy Tract Through Perinephric Fat in Assessing Renal Cell Carcinoma.

Perinephric fat invasion (PFI) is a key component of renal cell carcinoma (RCC) staging, but there is limited data pertaining to biopsy tract seeding (BTS), resulting in perirenal tissue involvement (BTS-P).