Firty to sixty per cent of all intracranial tumor in childhood occure in the posterior fossa. Because of then arrow confines of the posterior fossa, a tumor produces significant shifts of the arteries and veins allowing adecision to be made on the site of the tumor. Therefore vertebral angiography is a very importat diagnostic tool for detection of the posterior fossa tumor in children. Vertebral angiographic findings of twelve cases of proven childhood posterior fossal tumor at seoul National University Hospital during recent two years from Sep. 1976 are presented with operative and histopathologic findings. Location of the posterior fossa tumor can be suggested by vertebral angiographic criteria with high degree of acuracy in the majority of cases and prediction of the histopathologic type is possible according to the location of the tumor and incidence of a certain specific histopathologic type of the tumor along the site.