FIG 4. Type 2 disrupted cerebellar development.

A, Sagittal T2-weighted image shows a balloon-shaped fourth ventricle; a longitudinal, small vermis; and remarkable kinking of the brainstem.

B and C, Parasagittal T2-weighted (B) and frontal T1-weighted (C) images show small cerebellar hemispheres laterally located in the posterior fossa.