Chiari畸形Ⅰ型的MRI与临床分析

MRI and Clinical Analysis of Arnold-Chiari Malformation Type Ⅰ

目的：探讨Ｃｈｉａｒｉ畸形Ⅰ型的ＭＲＩ改变与临床表现之间的关系。材料与方法：１８例Ｃｈｉａｒｉ畸形Ⅰ型根据临床表现有无脑干及小脑受压症状分成两组，有者６例为Ａ组，无者１２例为Ｂ组，分别测量枕大孔的矢状径Ｄ、小脑扁桃体疝出枕大孔时的矢状径ｄ和小脑扁桃体疝出的长度Ｌ，计算ｄ／Ｄ比值。结果：产生脑干及小脑压迫症状与ｄ／Ｄ比值密切相关，而与Ｌ无明显关系。结论：如果ｄ／Ｄ比值超过０．４４时可产生脑干及小脑压迫症状。

Purpled: To study the relationship between MRI findings and clinical symptoms of Arnold-Chiari malformation type I. Materials and Methods: The eighteen cases were divided into two groups on the basis of whether compression of the brain stem and the cerebellum or not. 6 cases with the symptoms were A group, another 12 cases without the symptoms were B group. The sagitall diameter of foramen magnum (D), the sagitall diameter of tonsillae hernia where it was herniated from foramen magnum (d) and the distance of the tonsillae of cerebellum to be herniated (L) were measured repectively, the ratio of d/D was casted. Results: Statistical method has been used in this study, the result of t test showed that the compression symptoms of brain stem and cerebellum has significance correlation with d/D(P <0.05) and no significance relationship with L (P>0.05). Conclusion: The compression symptoms of brain stem and cerebellum can be caused if the ratio of d/D is larger than 0.44.