\s=b\A 43-year-old woman had an unusual case of non-Hodgkin's lymphoma (NHL) of the frontal sinus. Although the tumor was not diagnosed until after gross intracranial extension had already occurred, the patient's condition responded excellently to surgical debulking, frontal sinus obliteration, and chemotherapy. To date, she has had no neurologic sequelae or evidence of recurrence. In the past, stage 1 and 2 NHL of the nasal cavity and paranasal sinuses has been treated with primary radiation therapy, but a review of the literature shows that treatment failure is common in these cases. (Arch Otolaryngol 1984;110:270-273) Malignant lymphomas rarely orig¬ inate in the paranasal sinuses. Of all the cases of non-Hodgkin's lym¬ phoma (NHL) that occur in the head and neck region, less than 5% arise in the extranodal sites of the paranasal sinuses and nasal cavity, with the majority occurring in the lymph nodes and the lymphoid tissue of Waldeyer's tonsillar ring.1 In a large series of extranodal NHLs, Freeman