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Sagittal T1
MRI
Sagittal T1
Absent anterior interhemispheric falx
Absence of septum pellucidum and rostrum and genu of corpus collosum (atypical callosal dysgenesis) with hypoplastic optic nerves. Imaging features suggestive of lobar type of holoprosencephaly associated with septo-optic dysplasia
Large dorsal interhemispheric cyst ?subarachnoid cyst
Inferiorly placed cerebellar tonsils