We report the findings of an uncommon non-infectious cause of renal pseudotumor, perirenal fat necrosis, presenting as a native kidney mass in a renal transplant recipient. Resection was performed due to clinical suspicion for malignancy. To our knowledge this is the first report of a case of perirenal fat necrosis presenting in the transplant setting. This case emphasizes the need to continually expand our diagnostic considerations beyond epithelial and non-epithelial malignancies when confronted with native kidney masses in renal transplant recipients
