Unclassified cerebellar dysplasia is defined as focal or diffuse dysplasia of cerebellar hemispheres or vermis not associated with other known malformations or syndromes.
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Clinical presentation
Can present with hypotonia, microcephaly or speech delay.
Radiographic features
MRI
asymmetry or focal disruption of cerebellar folial and sulcal morphology
disorganized and disordered foliation
enlarged and vertically oriented fissures
cerebellar gray white matter heterotopia
bumpy gray-white matter interface in cerebellum
lack of normal arborization of white matter
abnormal hyperintense signal in subcortical white matter
Associated findings
corpus callosal agenesis/dysgenesis
macro-/microscopic heterotopia
cerebral cortical dysplasia
Differential diagnosis
On imaging consider:
cerebellar dysplasia associated with lissencephaly (congenital muscular dystrophy)
rhombencephalosynapsis: fused cerebellar hemispheres with vermian hypo/aplasia
molar tooth malformation (Joubert syndrome)
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