Resluts All the 14 cases showed clivus projecting intracranial.posterior displacement of Odontoid Process were found in 3 cases,with 1 case of Atlanto-occipita fusion malformation.

• 结果:14例MR矢状位像均显示斜坡向颅内陷入,3例见齿状突后移,1例合并寰枕融合畸形,14例均清晰地显示了延颈髓的形态及与小脑扁桃体的关系。