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.

14例MR像均示斜坡向颅内陷入,3例见齿突后移,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。

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.

前颅底、鞍底、斜坡处瘘口，除恶性肿的鼻漏，最佳的治疗方法是鼻内镜下修补瘘孔。