高分辨CT检查面神经管与周围结构解剖关系

Facial nerve canal and its relationship with adjacent structures on HRCT

目的探讨高分辨CT(high resolution CT,HRCT)中面神经管与周围结构解剖关系,为进行手术操作提供可靠信息。方法回顾2007年8月～2009年9月我院行颞骨HRCT检查且无颞骨病变的患者118例,其中男性65例,女性53例;在工作站上对轴位及重组出的矢状位、冠状位,观察各段面神经管周围重要结构的距离进行测量,比较不同侧别、性别上述测量值有无差异。结果垂直段前缘距外耳道后壁距离成人为(4 23±0.73)mm,垂直段距乙状窦前壁距离(9.93±2.16)mm,垂直段距蜗窗距离(3.21±0.31)mm,垂直段距鼓岬外缘最短距离(4.32±0.57)mm,砧骨短脚距面神经锥段距离(3.32±0.37)mm,水平段距蜗窗水平距离(2.28±0.48)mm,水平段距鼓岬外缘水平距离(2.23±0.18)mm,面隐窝宽度(5.12±0.31)mm。结论 HRCT是研究面神经管与周围结构影像解剖的优良方法,可为耳显微外科手术中避免面神经的意外伤害提供可靠信息。

OBJECTIVE To investigate high resolution CT（HRCT） findings of intratemporal facial nerve canal and its relationship with adjacent structures, and to evaluate their clinical significance.METHODS CT images were performed in 118 patients without abnormality of temporal bone.All original images were transferred to workstation for image processing.Facial nerve canal and its relationship with adjacent structures were measured.RESULTS The minimal distance between the mastoid segment and posterior wall of the external canal,promontorium tympani,oval window were （4.23±0.73） mm,（4.3210.57） mm,and（3.21±0.31） mm respectively.Distance between short limb of incus and pyramidal segment of facial nerve was （3.32±0.37） mm.Width of facial recess was（5.12±0.31） mm.Distance between the tympanic segment and promontorium tympani,oval window were（2.23±0.18） mm and（2.28±0.48） mm.CONCLUSION HRCT is a good method to study the anatomy of facial nerve canal and its relationship with adjacent structures,and may provide reliable information for the diagnosis of facial nerve disease and surgery.