<prompt> Which of the following is true about pleomorphic adenoma except ?Most common tumor of salivary glandsHas a tendency to invade perineural spaceMost commoly involves the parotid glandIt is also called a mixed tumor  <response>: Pleomorphic adenoma This is the Commonest neoplasm of Salivary glands. The most Common salivary gland involved is Parotid - represent about 60 tumors in the parotid. o Submandibular and minor salivary glands may also be involved rarely. Pleomorphic adenoma - Parotid Submandibular minor salivary glands. They are derived from a mixture of ductal epithelial and myoepithelial cells and therefore they show both epithelial and mesenchymal differentiation - Also called mixed tumor. 