A Case of Bilateral Paranasal Squamous Cell Carcinoma.

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We describe a rare case of bilateral paranasal squamous cell carcinoma. A 64-year-old man visited Toride General Hospital complaining of bilateral nasal obstruction and diplopia. He had undergone a right Caldwell-Luc procedure for a right squamous cell papilloma 14 years previously. Physical examination revealed polypoid masses in both nasal cavities. Although a CT scan showed bone destruction on both side of the skull base and in the lamina papyracea, invasion through the nasal septum and the medial wall of the ethmoids was not observed. Moreover, an MRI examination revealed cystic lesions in both frontal sinuses. The patient underwent endoscopic endonasal surgery. Microscopic examination of the tumor specimen obtained from the right nasal cavity showed a squamous cell carcinoma with inverted papilloma, while that obtained from the left nasal cavity showed a squamous cell carcinoma. Histologically, we could not determine if the bilateral carcinomas represented independent primary lesions or extensions from one side to the other.
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