Chiari畸形的MRI表现

MRI diagnosis of Chiari malformation

目的 :探讨Chiari畸形的MRI表现 ,并评价其临床应用价值。方法 :回顾性分析 31例Chiari畸形患者的MRI资料与临床资料。结果 :31例Chiari畸形患者小脑扁桃体疝至枕大孔平面下方 3～ 2 5mm。 2 0例合并脊髓空洞 ,枕大孔层面延前池前后径宽度为 0～ 5mm ,11例无脊髓空洞 ,延前池宽度为 4.5～ 6mm ,6例合并颅颈交界区畸形 ,4例合并脑积水。结论 :小脑扁桃体位于枕大孔下方≥ 5mm即可诊断为Chiari畸形 ;延前池前后径宽度变窄 (≤ 4mm)均出现脊髓空洞 ,而延前池宽度 >4mm则很少出现脊髓空洞 ,临床可根据延前池的宽度来评价预后及的手术效果。

Objective:To investigate the MRI manifestation of Chiari malformation and evaluate their clinical value.Methods:The MRI findings and clinical information of 31 cases were analyzed retrospectively.Results:The cerebellar tonsils of 31 cases displaced downwards 3～25mm below foramen magnum into upper cervical canal.20 cases were associated syringomyelia with 0～5mm cerebrospinal fluid space anterior to medulla oblongata.6 cases were accompanied by craniocervical junction bony anomlies,4 cases were associated hydrocephalus.Conclusion:Tonsillar herination ≥5mm below the foramen magnum may be diagnosed with Chiari malformation.Patients with narrowed cerebrospinal fluid space anterior the medulla oblongata (≤4mm) combined syingomyelia all,whereas patients with normal cerebrospinal fluid space anterior to medulla oblongata rarely developed syringomyelia in this group.