mediastinum

剑桥词典

[ 可数名词：有复数形式的名词 ] plural mediastina
a structure that divides a body part in the centre
（身体）纵隔
a mediastinal tumour 纵隔肿瘤

the area of the chest that contains the heart and other organs and tissues
纵隔腔 返回 mediastinum