Abstract
Primary carcinoma of the frontal sinus is extremely rare. As there is no characteristic clinical symptoms to the tumor, it is frequently mis-diagnosed as a mucocele or pyocele. But even with early detection and radical surgery the prognosis remains very poor. A case of primary carcinoma of the frontal sinus is reported. The patient, a 77-year-old female, was referred to with a painful swelling of the right frontal region, X-ray examination revealed clouding and a marked enlargement of the right frontal sinus. An extranasal frontal sinusectomy was performed under general anesthesia. Histopathological examination revealed squamous cell carcinoma Electron irradiation was given postoperatively. It is suggested that MRI contribute to differentiate the neoplasm from mucocele or pyocele.