An oncocytic mucoepidermoid carcinoma and an oncocytic pleomorphic
adenoma occurred in a 47-year-old male and a 75-year-old female,
respectively. Both presented as asymptomatic parotid gland masses
without evidence of facial nerve paralysis and were treated by
superficial parotidectomy. There has been no evidence of recurrence or
metastasis. Oncocytic change is rare in major salivary gland
mucoepidermoid carcinoma with only two previously reported cases. Marked
oncocytic transformation of pleomorphic adenomas can cause their
confusion with oncocytomas. Recognition of oncocytic differentiation in
various salivary gland tumours is important to avoid misclassification
of these lesions
