Conclusion: SCAL is the saf e foundation of FER PCD.To be familiar with anatomy structure and meaning of fu nction and obey the rules of operation can be good for preventing complications.

• 结论认为颈前外侧间隙是PCD前路穿刺安全的解剖基础.；熟悉解剖结构及其功能意义，严格按规程操作，可有效预防并发症，提高PCD手术成功率