Large head circumference.
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The posterior fossa is enlarged with a trocular lying above the level of the lambdoid (torcular-lambdoid inversion). There is a cystic dilatation of the 4th ventricle extending posteriorly forming a cystic space with an anterolateral displacement of the cerebellar hemispheres. Hypoplasia of the vermis with a cephalad rotation of the small vermian remnant. Gross hydrocephalus secondary to the posterior fossa abnormalities,
CT features are consistent with a Dandy-Walker malformation.