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为探讨Chiari－Ⅰ型畸形的影像学表现及其病理改变与枕大孔区骨畸形的关系，本文总结Chiari—Ⅰ型畸形41例，MR检查28例，CT检查29例，两种检查手段均应用者8例，CTM检查9例。结果：CT组病至枕大孔与颈1下缘之间25例；病至颈2以下4例。轴位扫描图像均表现为颈髓后方自枕大孔向下逐渐变小的椭圆形软组织块影。CTM检查9例，颈髓受压变形8例。矢状重建图像均表现为位于颅后窝内的小脑扁桃体向下伸入椎管内。MR组28例均示下疝范围为5～8mm，病入的小脑扁桃体呈楔形，不对称下病26例，对称性下病2例。，CT与MR均能显示Chiari－Ⅰ型畸形的病理特征；颈髓、延髓屈曲是由于合并颅底凹陷症所致，并非Chiari－Ⅰ型畸形本身的病理改变。
In order to investigate the relationship between Chiari-Ⅰ deformity imaging and pathological changes and bone deformity in the foramen magnum, 41 cases of Chiari-Ⅰ deformity, 28 MR examinations and 29 CT examinations were summarized. Both examinations 8 cases of application, CTM examination in 9 cases. Results: CT group disease to the foramen magnum and neck 1 between the lower edge of 25 cases; disease to the neck 2 in 4 cases. Axial scan images showed the back of the cervical cord from the occipital hole down gradually smaller oval soft tissue block shadow. CTM examination in 9 cases, cervical compression deformation in 8 cases. The images of sagittal reconstruction showed the cerebellar tonsils located in the posterior fossa of the skull extending downward into the spinal canal. 28 cases of MR group showed hernia range of 5 ~ 8mm, ill into the cerebellar tonsils were wedge-shaped, under asymmetric disease in 26 cases, symmetry in 2 cases. , CT and MR can show pathological features of Chiari-Ⅰ deformity; cervical spinal cord, bulbar flexor due to a combination of skull base depression, not Chiari-Ⅰ type deformity itself pathological changes.