抄録
Fourty laryngectomy specimens were histopathologically studied by serial sections. The following results were obtained: 1. The incidence of carcinomatous invasion of the thyroid cartilage was 55%, and that of the cricoid cartilage was 35% in glottic carcinomas. The incidence of frame-work invasion was closely related to the extension to the subglottic region. 2. Invasions of laryngeal frame-wark were observed at the anterior commissure and lower portions of the thyroid cartilage and the upper portion of the cricoid cartilage. 3. In half of the cases of anterior commissure involvement, thyroid cartilage invasion at the anterior commissure was observed. 4. Fixation of the vocal fold in glottic carcinoma was accounted for by carcinomatous invasion into three fourths or more of the thyroarytenoid muscle. Impairment of the vocal fold movement was accounted for by carcinomatous invasion into three fourths or less of the thyroarytenoid muscle. 5. In cases concerning involvement of both vocal folds, conservation surgery should be indicated only in those in which the carcinoma lesion of the contralateral side is superficial.
