喉的跨越声门癌是指越过喉室侵袭真、假声带而言。肿瘤来源可为声门向上、或声门上向下、或在喉室内向上下扩散。本型肿瘤之生物学特性为假声带粘膜下浸润,声门旁间隙、软骨侵蚀并有30～40%颈淋巴结转移;某些病例以其有限的粘膜扩展,被错误地认为可用标准的垂直半喉切除术,然而术后复发占40～50%,其原因如下:在上切缘下有粘膜下肿瘤;肿瘤直接或经淋巴扩散至会厌前间隙;在声门旁间隙肿瘤侵及切缘外侧,或侵袭甲状软骨板之后切口。用半喉切除 Throat crossing Glottic cancer means crossing the throat and attacking the true and false voices. The source of the tumor may be a glottal upward, or a downward glottis, or an upward or downward diffusion in the laryngeal cavity. The biological characteristics of this type of tumor are submucosal infiltration of the pseudo-vocal cords, paraglottic space, cartilage erosion, and 30 to 40% of cervical lymph node metastases; some cases have been mistaken for the use of the standard vertical half because of their limited mucosal expansion. Laryngectomy, however, accounts for 40 to 50% of postoperative recurrences. The reasons are as follows: there is a submucosal tumour under the upper margin; the tumour spreads directly or through lymph to the pre-epimeutal space; in the paraglottic margin the tumour invades the outside of the margin Or incision after the invasion of the thyroid cartilage plate. Half-throat resection