part_of part of part of has_disease_location saliva-secreting gland salivary gland neoplasm Parotid Gland Pleomorphic Adenoma A benign, slow-growing tumor that arises from the parotid gland. It is composed of cells that demonstrate both epithelial and mesenchymal differentiation. It is the most common neoplasm of salivary gland origin and women are more often affected than men. NCIt:C4650