展神经3D-FIESTA MRI表现

Evaluation of the cisternal segment of the abducent nerve and arteries adjacent to these nerves by magnetic resonance hydrography

目的:探讨3D-FIESTA序列磁共振水成像(MRH)对脑池段展神经及毗邻血管解剖关系的显示效果和诊断价值。方法:30例患者(60侧)采用3.0T MR机行横轴面及斜矢状面FIESTA序列MRI检查。结果:展神经在横轴面和斜矢状面图像上的显示率均为93.3%。在展神经与血管关系中,小脑前下动脉(AICA)显示率最高,51条AICA在展神经区域显示,其中30条(58.8%)与展神经接触,21条(41.2%)与展神经无接触;32条(62.7%)行经展神经下方,19条(37.3%)行经展神经上方。VA为显示率较高的动脉,8条VA在展神经区域显示,其中6条(75%)与展神经接触,2条与展神经密切接触而不能区分其位置关系。结论:3D-FIESTA序列MRI可清晰显示脑池段展神经以及与相邻脑血管的复杂解剖关系,发现此区域神经及血管的微小病变,为显微外科治疗计划的制订提供准确的影像信息。

Objective： To explore the displaying efficiency and dignostic value of magnetic resonance hydrogrophy（MRH） for the cisternal segment of the abducent nerve and adjacent vascular structures.Methods：Thirty subjects（60 sides）,including 15 men and 15 women,with mean age of 47 years,underwent 3D FIESTA sequence at a 3.0T magnetic resonance scanner,using axial and oblique sagittal sections.Results：On axial and oblique sagittal images of MRH,the rates of the displaying abducent nerves were 93.3%.In relation between the abducent nerve and arteries,the anterior inferior cerebellar artery（AICA） was the most often identified.It was found to be in contact with or not in contact with the abducent nerve in 58.8% and 41.2%,respectively.It was documented that 62.7% AICAs was going below the abducent nerve,and 37.3% above abducent nerve.The vertebral artery（VA） was more often identified in the area of abducent nerve.In this series,6 VAs were visible to be in contact with the abducent nerve,and 2 VAs in close contact with the adjacent arteries and their relationship couldn＇t clearly shown.Conclusion： In virtue of predominance on displaying cisternal segments of the abducent nerve and vessles in this region it may help to find out micro lesions by using 3D FIESTA and MPR technique.It may provide a very useful tool for further seting up the therapeutic program of microneurosurgery.