Results FER of PCD began wit h crossing the space of carotid sheath and trachea or esophagus, having cervical fascia, space and prevertebral layers there.

• 结果PCD前入路通过颈动脉鞘与气管及食管之间的间隙，该间隙内主要为颈部筋膜及筋膜间隙，深面为椎前组织。