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声门下区似圆筒形,其下边亦即环状软骨的下缘,其上界为声带游离缘下5毫米处的假想圆圈。在591例声门及声门下癌中,仅5例(1％)原发于声门下区,132例(22％)为声门癌有声门下扩展。原发性声门癌有声门下扩展者,65％为Ⅱ期;35％为Ⅲ期。多经手术治疗,上述Ⅱ期病变及一些Ⅲ期病变,经半喉切除术,效果较满意。Ⅱ、Ⅲ期病变侵入声门下区大干10毫米者,其预后显著变差。T_3病变有声带固定及扩展至声门下者,其存活率亦将减少。
The subglottic area resembles a cylinder, with the lower edge of the lower edge of the cricoid, the upper bound being the imaginary circle 5 mm below the free edge of the vocal fold. Of the 591 cases of glottic and subglottic cancers, only 5 (1%) developed their origin in the subglottic area and 132 (22%) developed subglottic glottic cancer. Primary glottic cancer with subglottic expansion, 65% for stage Ⅱ; 35% for stage Ⅲ. More by surgery, the above-mentioned stage Ⅱ disease and some Ⅲ lesions, the semilunctomy, the effect is more satisfactory. Ⅱ, Ⅲ disease invasion of the subglottic giganteous 10 mm, the prognosis was significantly worse. T_3 lesions have vocal cord fixation and expansion to the glottis, the survival rate will also be reduced.