Myoepitheliomas and malignant myoepitheliomas were considered a variant of pleomorphic adenomas until 1991. However, these are also found in breast and bronchus and have gained recognition as separate entities. They account for less than 1% of salivary gland tumors, only rarely undergo malignant transformation (0.2-0.45% of all malignant salivary gland tumors).
Age of presentation ranges from 20-60 years of age, and parotid gland and accessory salivary glands are the main sites of occurrence.
Imaging appearance is essentially the same as pleomorphic adenomas.