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."