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).
Imaging appearance is essentially the same of pleomorphic adenomas.
- 1. Monzen Y et al "Myoepithelioma and malignant myoepithelioma arising from the salivary gland" Australasian Radiology Vol 51, Dec 2007