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Small cell neuroendocrine carcinomas of the sinonasal tract are extremely uncomon tumors, and they have been recognized as a highly agresive neoplasm with poor prognosis. The authors experienced a case of small cell neuroendocrine carcinoma of e round or oval and hyperchromatic. Imunohistochemical study showed small cell neuroendocrine carcinoma. The chest X-ray and CT scan of chest showed no evidence of primary lung lesion. The patient received chemotherapy, but died from cerebral infarction and its complication. We report our case with a brief review of the literatures.(Korean J Otolaryngol 2003 ;46 :164-7)