The etiologies of chylothorax are: tumor (54%, with lymphoma responsible for three-quarters), trauma (25%, with surgical trauma responsible for most), idiopathic (15%), and miscellaneous (6%).

• 乳糜胸的病因如下：肿瘤（54%25，其中淋巴肿瘤占四分之三），创伤（25%25，手术占大部分），原因不明(15%25)，其它病因(6%25)。