Small cell carcinoma of the oral cavity: report of a rare case.

Small cell carcinoma is primarily a lung malignancy occurring rarely in extra pulmonary sites such as the larynx, nasal cavity, paranasal sinuses, and oral cavity. The authors report a rare case of primary small cell carcinoma of the maxillary sinus presenting as a growth of the alveolus extending into the hard palate and the buccal vestibule.