Cases with malignant tumors of the larynx other than squamous cell carcinomas were reported. 595 patients (551 males, 44 females) with previously untreated malignant tumors of the larynx who had undergone treatment in the Kurume University Hospital from 1980 to 1996 were retrospectively reviewed. There were 13 cases (2.2% ) with malignant tumors of the larynx other than squamous cell carcinomas: 3 patients with carcinoid tumor, 2 with carcinosarcoma, 2 with verrucous carcinoma, 2 with ATL, 1

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... h undifferentiated carcinoma, 1 with chondrosarcoma, 1 with pseudosarcomatous squamous cell carcinoma and 1 with rhabdomyosarcoma. Histologicaly diagnosis before the operation was determined in only one case (carcinoid) , while the other 12 cases were diagnosed after the operation. Since in many cases preoperative diagnosis based on biopsy was not reliable for these rare malignant tumors of the larynx, final true diagnosis was determined based on resected laryngeal specimens. On the other hand since the grade of malignancy depends strongly on the histological property, an appropriate choice of treatment is definitely important.