Posterior fossa anomalies

on 6.2.09 with 0 comments

  • Arnold-Chiari malformation

    • Small posterior fossa, cerebellar vermis displaced through the foramen magnum (not to be confused with tonsillar herniation – this is the vermis, not the tonsils)

    • Vermis and/or medulla may become kinked as they pass though the foramen magnum

    • Often associated with hydrocephalus, and it may be associated with a lumbar menigomyelocele

  • Dandy-Walker malformation

    • Posterior fossa is larger than normal and the vermis is absent or rudimentary

    • The 4th ventricle is cystically dilated and takes up the space where the vermis should be

Category: Pathology Notes



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