Holoprosencephaly
- Alobar: fused thalami, single large ventricle
- Semilobar: basic cerebral hemispheres but fused anterior thalami, absent olfactory tracts and agenesis/hypoplastic corpus callosum
- Lobar: subtle midline abnormality with fusion of cingulate gyrus, thalamus and hypoplastic corpus callosum
- Septo-optic dysplasia: sort of on the spectrume of holoprosencephaly; 50% associated with schizencephaly; absent septum pellucidum and optic nerve hypolasia
Neuronal Migration Abnormalities
- Lissencephaly
- Polymicrogyria
- Schizencephaly
- Porencephaly
- Focal cortical dsyplasia
- Grey matter heterotopia
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