1.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.

1.14例MR矢状位像均示斜内陷入,3例见齿状突后移,1例合并寰枕融合畸形,14例均清晰地示了延颈髓的形态及与小脑扁桃体的关系。

2.Conclusion: The best treating method of rhinorrhe in front bases of skull, bases of saddle and clivus blurnenbachii orificium fistulae except malignant tumor is endoscopic repair of fistubus opening.

2.前底、鞍底、斜口，除恶性肿瘤引起的鼻漏，最佳的治疗方法是鼻内镜下修补孔。