An alternative therapeutic procedure for sinonasal undifferentiated carcinoma.

We describe two cases of sinonasal undifferentiated carcinoma, a rare and highly aggressive neoplasm of the paranasal sinuses. Case 1 had first been diagnosed as esthesioneuroblastoma, and intra-arterial and systemic chemotherapy and radiotherapy were performed. The tumor became smaller but did not disappear, and the patient died 2 months later. Case 2 received systemic chemotherapy and chemoradiotherapy, with daily venous administration of cisplatin during radiotherapy. The tumor became much smaller but also remained, and the patient died a month later. Although the therapy failed, chemoradiotherapy has some possibility of controlling the disease.