儿童胸腔内肿瘤最常位于纵隔内。人们常常用前纵隔、中纵隔和后纵隔来描述及定位纵隔肿瘤 ,但是前纵隔、中纵隔和后纵隔在解剖中并非存在 ,只是人为的划分 ,且有些纵隔肿瘤往往不局限于一个空间。但是为了叙述的方便 ,这里仍然延续这种描述方法。1　前纵隔肿瘤纵隔肿块中 ,前纵 Thoracic tumors in children are most often located in the mediastinum. Anterior mediastinum, middle mediastinum and posterior mediastinum are often used to describe and locate mediastinal tumors. However, anterior mediastinum, middle mediastinum and posterior mediastinum are not anatomical, but only artificially divided, and some mediastinal tumors are often not confined to a single space. However, for the convenience of narration, this description method is still extended here. Anterior mediastinal tumor mediastinal mass, the first longitudinal