Agenesis of the Corpus Callosum

Growth anterior to posterior starting at the genu. Myelination from posterior to anterior.

Association with Chiari II, Dandy Walker, Holoprosencephaly and lipomas. Partial agenesis often associated midline lipomas.

Splaying of the anterior horns (Bulls horn appearance) due to realignment of the probst bundles.

High third ventricle.

Colpocephaly (splaying of the atria).

Absent cingulate sulcus.

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