Adenoid Cystic Carcinoma of Maxillary Sinus: An Usual Tumor at Unusual Site

Adenoid cystic carcinoma is a relatively uncommon tumor of malignant behavior arise in the maxillary sinus. The tumor usually occurs in the salivary gland. Adenoid cystic carcinoma is a slow growing mass associated with pain. Female preponderance is noted. Microscopically the tumor exhibits various growth patterns tubular, cribriform and solid pattern. Tumor is composed of dual type of cell population, ductal epithelial cells and myoepithelial cells that line the aforementioned ducts. Immunohistochemistry plays a vital role in diagnosis of Adenoid cystic carcinoma.