label: Parotid Gland Adenoid Cystic Carcinoma
label_lc: parotid gland adenoid cystic carcinoma
description: An aggressive carcinoma that arises from the parotid gland.  It is characterized by the presence of malignant epithelial and myoepithelial cells forming cribriform, tubular, and solid patterns.  It usually presents as a slow growing mass.  Patients develop pain because of the tendency of these carcinomas to invade perineural tissues.