Mega cisterna magna

  • Normal fourth ventricle
  • Normal cerebellum
  • Dilatation of CSF posterior to cerebellum
  • Simplest form of Dandy-Walker complex

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Kollias, Spyros S., William S. Ball Jr, and Erin C. Prenger. “Cystic malformations of the posterior fossa: differential diagnosis clarified through embryologic analysis.” Radiographics 13.6 (1993): 1211-1231.