Dandy Walker Variant

  • Etiology: abnormality of ventral induction
  • Imaging: milder inferior verminan + cerebellar hemispheric hypoplasia, smaller posterior fossa cyst which does not wrap around cerebellum, normal sized posterior fossa

Radiology Cases of Dandy Walker Variant

MRI of Dandy Walker variant
Sagittal T1 MRI with contrast of the brain (upper left) shows an normal size posterior fossa containing a dilated fourth ventricle resulting in a small midline cyst. Axial (upper right) and coronal (below) T1 MRI with contrast of the brain show hypoplasia of the cerebellar vermis. No hydrocephalus is present.