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Posterior fossa cystic abnormalities:
DW malformation (vermian hypoplasia/aplasia and large posterior fossa), DW variant (normal size posterior fossa and vermian hypoplasia), megacisterna magna (normal vermis), retrocerebellar arachnoid cyst (must show mass effect), Chiari 4 (near complete absence of cerebellum), epidermoid/dermoid, cystic tumor, Joubert�s syndrome (superior vermian hypoplasia/aplasia), rhomboencephalosynapsis (vermian hypoplasia/aplasia + fusion)
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Absent septum pellucidum:
holoprosencephaly, ACC, septooptic dysplasia, Chiari 2
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Migration and sulcation anomalies:
lissencephaly, schizencephaly, polymicrogyria, pachygyria, cortical heterotopia (focal, diffuse, subependymal), hemimegalencephaly
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Phakomatoses:
NF, TS, VHL, Sturge-Weber
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Diffuse marrow involvement:
mets, myeloma, lymphoma, leukemia, anemia, Paget�s, FD
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