Because the trachea and thyroid gland adjoin to the subglottic area, the tumor invades them along with the superior mediastinum and lung by the way of paratracheal lymph drainage.

• 以其和气管及甲状腺密接的解剖相关，常使肿瘤向下及向外侵犯，并藉由气管旁淋巴组织转移到上纵膈腔及肺部。