Dandy-Walker malformation with callosal dysgenesis

Case contributed by Dr Ammar Haouimi


Increased head circumference (?hydrocephalus).

Patient Data

Age: 4 years
Gender: Male

MRI sequences demonstrate:

  • enlarged posterior pericerebellar space communicating with cystic dilatation of the 4th ventricle through vermian hypoplasia with a moderate anterolateral displacement of the cerebellar hemispheres.
  • dilated of the 3rd/lateral ventricles with patent cerebral aqueduct (of Sylvius) 
  • dysgenesis of the corpus callosum.
  • extra-axial cysts of CSF signal in the middle cerebral fossae (arachnoid cysts).


Case Discussion

MRI features of a Dandy-Walker malformation with associated hydrocephalus, callosal dysgenesis, and arachnoid cysts of the middle cranial fossae type I according to the Galassi classification of middle cranial fossa arachnoid cysts.

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