Oncocytoma
![](/Images/godic/202501/31/Parotid_gland_oncocytoma_-_very_high_mag5501.jpg")
![Gross appearance of the cut surface of a nephrectomy specimen containing a renal oncocytoma. Note the rounded contour, the mahogany colour and the central scar.](/Images/godic/202501/31/Renal_oncocytoma5501.jpg")
![Oncocytoma of the salivary gland. This lesion presented as a lateral anterior neck mass. At surgery, it was found to be a soft 3.0 × 2.1 × 1.8 cm tumor of the submandibular salivary gland. The photo shows the characteristic dark color of an oncocytoma, a rare type of benign neoplasm, at the left side of the image (the normal lobulated salivary gland tissue is to the right).](/Images/godic/202501/31/Oncocytoma_of_the_Salivary_Gland5501.jpg")
An oncocytoma 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.