MRI measurements the linear volume of posterior cranial fossa in patients with hemifacial spasm. (July 2022)

• Record Type: Journal Article
• Authors: Zhou, Jianxin; Zhan, Yan; Xie, Yanfeng; Deng, Bo; Yuan, Sangui; Jiang, Li; Shi, Quanhong
• Is Part Of: Journal of clinical neuroscience. Volume 101(2022)
• Page Start: 94
• Page End: 99
• Publication Date: 2022-07
• Subjects: Hemifacial spasm -- Posterior fossa -- Linear volume -- MRI -- Complication; Brain -- Surgery -- Periodicals; Neurosciences -- Periodicals; Nervous system -- Surgery -- Periodicals; Brain -- surgery -- Periodicals; Neurosurgical Procedures -- Periodicals; Neurosciences -- Periodicals; Electronic journals; 616.8
• DOI: 10.1016/j.jocn.2022.04.043
• Languages: English
• ISSNs: 0967-5868

Abstract

Highlights: The development of posterior fossa could be indirectly evaluated by measuring the relative lengths and angles on MRI. The posterior fossa space in patients with HFS is narrower than that in normal. The crowded posterior fossa will increase the difficulty of operation, and lead to an increase in the incidence of postoperative facial paralysis and hearing loss. Abstract: To explore the pathogenesis of hemifacial spasm (HFS) and the effect of posterior fossa volume on postoperative complications. The measurements of the antero-posterior diameter of foramen magnum, the length of supraocciput, the angle of tentorium cerebelli, clivus and occipital bone were performed on MRI. The data of measurements and postoperative complications were then analyzed and statistically examined. The antero-posterior diameter of the foramen magnum was smaller in HFS group (34.98 ± 2.83) mm than in control group (35.83 ± 2.67) mm ( P < 0.05); The length of supraocciput was smaller in HFS group (44.67 ± 4.48) mm than in control group (45.84 ± 4.25) mm ( P < 0.05); The angle of tentorium cerebelli was larger in HFS group (41.03 ± 5.01)°than in control group (37.28 ± 4.31)° ( P < 0.05); The angle of clivus was smaller in HFS group (52.71 ± 6.22)° than in control group (56.39 ± 6.61)° ( P < 0.05). The operation time was significantly longer in crowding group (107.90 ± 26.20) min than in non-crowding group (96.48 ± 20.52) min ( P < 0.05); The incidence of postoperative facial paralysis was significantly higher in crowding group (16.19%) than in non-crowding group (7.20%) ( P < 0.05); The incidence of postoperative hearing loss was significantly higher in crowding group (13.33%) than in non-crowding group (4.00%) ( P < 0.05). Factors such as shorter antero-posterior diameter of foramen magnum, lower tentorium cerebelli, and shorter length of supraocciput in patients with HFS indicate the posterior fossa dysplasia and promote the occurrence of HFS. The crowding of the posterior fossa will increase the difficulty of the surgery and the incidence of postoperative facial paralysis and hearing loss.