Agenesis of the corpus callosum at 28 and 35 weeks

(A) A normal median section showing the normally developed corpus callosum for comparison.

(B and C) Agenesis of the corpus callosum at 28 weeks showing the lateral ventricles (Lv) pointing up (Viking helmet).

(C) The third ventricle (arrow) is displaced up coming all the way to the falx cerebri.

(D) Agenesis of the corpus callosum at 35 weeks showing a section similar to panel B.