Oncocytomas of the salivary glands

Two cases of oncocytoma of the parotid gland are presented, one of which was dominantly cystic and had recurred after 21 years. The light and electron, microscopic pictures are presented. The literature has been reviewed, and 131 cases were found in salivary glands; hence, oncocytomas in this location are rare. In older persons, they are found predominantly in the parotid gland, but have also been reported in the minor salivary glands. It is pointed out that electron microscopy or histochemical examination is indispensable for the demonstration of mitochondrial hyperplasia.