A case of transitional cell carcinoma(TCC)of the frontal sinus is reported.An 83-year-old man complained of left exophthalmos and nasal obstruction. On examination, the nasal cavity was blocked with a polypoid swelling. Computed tomography and magnetic resonance imaging demonstrated tumor in the frontal sinus and mucocele in the paranasal sinus. The mass in the left frontal sinus was excised and diagnosed as TCC. The treatment was performed by a linear accelerator. The prescribed dose was 70

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... Irradiation was performed without effect, and the patient died 1 year later. Previous reports of TCC in the paranasal sinus are reviewed and discussed.