Dynamic MRI Scanning and Hernia Degree in Chiari Malformation:a Correlation Analysis
Objective To observe the changes of hernia degree in Chiari malformation during dynamic MRI scanning and evaluate the impact of positional changes on hernia degree.Methods 45 patients with Chiari malformation admitted to the First People's Hospital of Fuzhou City,Jiangxi Province from March 2021 to March 2024 were selected as the study subjects.Dynamic MRI scanning(hyperflexion,hyperextension,and standard positions)was performed on the patients using a dedicated MRI neck coil.Sagittal and transverse axial sequences were used,and the values of cerebellar herniation were measured in the hyperflexion,hyperextension,and standard positions.Multiple measurements were taken at the median,right paramedian,and left paramedian levels.Results In the median level,the value of cerebellar herniation was greatest in the standard position,followed by the hyperflexion position,and smallest in the hyperextension position;in both the right and left paramedian levels,the degree of cerebellar herniation measured in the hyperflexion position was similar to that in the standard position,while it was smallest in the hyperextension position;in all three levels(median,right paramedian,and left paramedian),the degree of cerebellar herniation measured in the hyperflexion position was greater than that in the hyperextension position.Among the 30 middle-aged and elderly patients aged 40 and above,the degree of cerebellar herniation detected in the hyperflexion position at the median level was significantly greater than that in the standard position(P=0.049).Conclusion Dynamic MRI scanning can effectively reflect changes in the degree of cerebellar tonsillar herniation in different positions,and hyperflexion measurement is potentially superior to hyperextension measurement in most cases.
Chiari malformationdegree of cerebellar herniationmedian levelparamedian leveldynamic MRI scan
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