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Absent anterior interhemispheric falx.
Absence of septum pellucidum and rostrum and genu of corpus callosum (atypical callosal dysgenesis) with hypoplastic optic nerves. Imaging features suggestive of lobar type of holoprosencephaly associated with septo-optic dysplasia.
Large dorsal interhemispheric cyst.
Inferiorly placed cerebellar tonsils.