Discussion: 

Oncocytic Carcinoma of the Salivary Gland occurs mostly in the major salivary glands. The key features favoring an Oncocytic lesion of the Parotid Gland are epithelial cells that have an abundant, granular, eosinophilic cytoplasm, numerous mitochondria, and a central pyknotic nucleus. The tumors are usually single, irregular and firm with a presence of swelling on the effected side of the face and pain from possible invasion of the nerves with facial paralysis and eating difficulties.

Differential Diagnosis:

The differential diagnosis of Oncocytic Neoplasm is:
Pleomorphic Adenoma
Myoepithelioma
Warthin’s tumor
Acinic Cell Carcinoma
Mucoepidermoid Carcinoma