Abstract：Objective To analyze the CT findings of each segment of facial nerve canal in congenital abnormalities of external and middle ear (CAEM) and evaluate the clinical value of multi-slice CT (MSCT).Methods The clinical data of 18 patients(26 eras) with CAEM(lesion group) and 18 patients(26 eras) of temporal bone without abnormality(control group) wer retrospectivelye analyzed. Both groups received multiplanar reconstruction (MPR) and curved planar reformation (CPR) in the Affiliated Nanjing Tongren Hospital of Southeast University Medical College from July 2008 to October 2014. The length and included angle of the facial nerve canal structures were measured in MPR images and the appearances of the facial nerve canal in two groups were compared. Fenestra vestibule was observed if it was overspreaded by the facial nerve canal on MPR and CPR imaging.Results The measurements of facial nerve canal in lesion group were as follows: the length of tympanic segment/labyrinth/ mastoid segment were(3.38±0.44) mm, (10.07±1.23) mm,(9.25 ± 2.44)mm, the angle of Ⅰ and Ⅱ were 65.10°±9.14° and 103.52°±8.79°, respectively. The measurements of facial nerve canal in matched group were as follows: the length of tympanic segment/labyrinth/ mastoid segment were(3.72±0.30) mm,(11.4±0.55) mm,(9.92±1.67) mm, the angle of Ⅰ and Ⅱ were 65.62°±6.30° and 112.10°±5.84°, respectively. There were significant differences in the length of tympanic segment/labyrinth segment and included angle of Ⅱ between the CAEM and normal groups (all P values＜0.01); There was no significant difference in the length of mastoid segment and included angle of Ⅰ between the two groups (all P values＞0.05). The incidence rate of fenestra vestibule overspreaded by the facial nerve canal on MPR and CPR images was 46.15%(12/26). There was no significant difference between the two groups.Conclusions The anatomical structure of facial nerve canal in CAEM patients can be demonstrated by MSCT and reconstruction technique, which provides the accurate information to the clinical diagnosis and treatment.
车子刚,孟玮,彭新桂,储成凤,葛洪,张庆宇,龚单春,张庆翔,于振坤. 多层螺旋CT容积扫描在先天性外中耳畸形面神经管影像测量中的对照研究[J]. 中华解剖与临床杂志, 2016, 21(1): 1-5.
Che Zigang, Meng Wei, Peng Xingui, Chu Chengfeng,Ge Hong, Zhang Qingyu, Gong Sanchun, Zhang Qingxiang, Yu Zhenkun. Evaluation of facial nerve canal in congenital abnormalities of external and middle ear based on volume scanning of multi-slice CT. Chinese Journal of Anatomy and Clinics, 2016, 21(1): 1-5.
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