An<unk>  is a tumor made up of oncocytes, epithelial cells characterized by an excessive amount of mitochondria, resulting in an abundant acidophilic, granular cytoplasm. The cells and the tumor that they compose are often benign but sometimes may be premalignant or malignant.
Oncocytoma
Pineocytoma
Mastocytoma
Histiocytoma
Melanocytoma
Angiolipoma
Pleomorphic adenoma
Renal oncocytoma