迷路下入路开放内耳道手术相关解剖结构的CT测量

目的　为临床上开展迷路下入路开放内耳道手术提供影像学参考信息。方法　选择40例（80侧）正常成人颞骨CT影像资料，对迷路下入路开放内耳道手术的相关解剖标志进行影像学测量。结果　后半规管下端到颈静脉球顶端之间的最短距离平均值为左侧（4.69±2.91）mm，右侧（3.10±3.01）mm，后半规管下部骨质厚度平均值左侧（0.92±0.37）mm，右侧（0.69±0.37）mm，迷路下区面神经垂直段骨管和乙状窦骨板之间的最短距离平均值左侧（8.66±2.71）mm，右侧（7.74±1.99）mm，颈静脉球顶端到内耳道下界距离平均值左侧（6.32±2.88）mm，右侧（5.39±2.61）mm，颈静脉球顶端到单孔距离平均值左侧（6.82±3.02）mm，右侧（5.84±2.82）mm，前庭导水管开口到内耳门后缘的距离平均值为左侧（14.38±2.56）mm，右侧（14.12±2.76）mm，前庭导水管开口到内耳道中点的距离平均值为左侧（12.02±2.46）mm，右侧（11.91±2.53）mm。前3组测量值左右侧差异有统计学意义，后4组测量值左右侧差异无统计学意义。结论　术前行影像学测量能够为开展迷路下入路开放内耳道手术提供有价值的信息。

Computed tomographic analysis of anatomic structure related to the infralabyrinthine approach to the internal auditory canal

OBJECTIVE To provide computed tomographic reference for the infralabyrinthine approach to the internal auditory canal.METHODS Temporal bone CT images of forty patients(80 sides) were randomly selected without ear lesions,and some relative structures were observed and measured.RESULTS The mean distance from the inferior edge of the posterior semicircular canal to the superior edge of the jugular bulb was (4.69±2.91)mm left and (3.10±3.01)mm right,the mean thickness of the bone inferior to the posterior semicircular canal was (0.92 ± 0.37)mm left and (0.69 ± 0.37)mm right,the mean distance from the vertical portion of the facial nerve to the anterior edge of the sigmoid sinus was (8.66±2.71)mm left and (7.74± 1.99)mm right,the mean distance from the superior edge of the jugular bulb to the internal auditory canal was (6.32 ± 2.88)mm left and (5.39 ± 2.61) mm right,the mean distance from the superior edge of the jugular bulb to the single foramen was (6.82 ± 3.02)mm left and (5.84 ± 2.82)mm right,the mean distance from the external aperture of vestibular aqueduct tothe posterior edge of internal acoustic porus was (14.38 ± 2.56)mm left and (14.12±2.76)mm right,the mean distance from the external aperture of vestibular aqueduct tothe midpoint of internal auditory canal was (12.02 ± 2.46)mm left and (11.91 ± 2.53)mm right.There were statistical differences in distances of different sides among the anterior three groups,no statistical differences were seen in distances of different sides among the posterior four groups.CONCLUSION The temporal bone CT images are helpful to the infralabyrinthine approach to the internal auditory canal.