The differentials considered were oncocytic renal tumours such as eosinophilic solid and cystic renal cell carcinoma, eosinophilic variant of chromophobe renal cell carcinoma, hybrid oncocytic/chromophobe tumour (HOCT), low grade oncocytic tumour (LOT), high grade oncocytic tumour (HOT), ALK rearranged renal cell carcinoma, MiT family translocation renal cell carcinoma, and epithelioid angiomyolipoma (AML). This evidence concerns the gene ALK and oncocytic neoplasm.