title: Agenesis of the vermis cerebelli and malformations of the posterior fossa in childhood and adolescence.
abstract: Three cases of cerebellar vermis agenesis are reported and the relevant literature (19 other cases) is reviewed. Other posterior fossa malformations, such as a mega-cisterna magna, arachnoid cyst and Dandy-Walker syndrome, are discussed both from the pathological and clinical view point. We put forward a hypothesis that agenesis of the cerebellar vermis and Dandy-Walker syndrome could be regarded as two different stages of the same malformation.
mesh_terms: D001099:Arachnoid / Q000002:abnormalities; D002531:Cerebellum / Q000002:abnormalities*; D002675:Child, Preschool; D002946:Cisterna Magna / Q000002:abnormalities; D003388:Cranial Fossa, Posterior; D003560:Cysts / Q000209:etiology; D003616:Dandy-Walker Syndrome / Q000209:etiology*; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000209:etiology*; D007223:Infant; D008297:Male