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Table 1: 
Categorization of intracranial anomalies seen on MR imaging studies
Type of Brain Abnormality
Forebrain DevelopmentalMid- or Hindbrain DevelopmentalCSF-RelatedWM
Callosal dysgenesisPontine hypoplasiaVentriculomegalyPatchy foci of abnormal WM signal (nonspecific)
Cortical malformations (pachygyria)Dandy-Walker malformationEnlarged extra-axial CSF spacesDelayed myelination
Gray matter heterotopiasCerebellar hypoplasiaArachnoid cystsPVL
Porencephalic cystsVermian hypoplasia
Septo-optic dysplasiaPontine tegmental cap dysplasia