NCIt definition : A benign, slow-growing tumor composed of cells that demonstrate both epithelial and
mesenchymal differentiation. It is the most common neoplasm of salivary gland origin,
and mostly occurs in the parotid gland. The average age of patients has been reported
to be 43 years; women are more often affected than men. The malignant change rate
has been estimated to be 6%. The malignant counterpart is carcinoma ex pleomorphic
adenoma.;