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Table 2: Structural brain abnormalities
Location No.
Posterior fossa 
    Cerebellar hypoplasia 18
    Atrophy of cerebral peduncle 2
Malformations of cortical development 
    Callosal dysgenesis 3
    Hemispheric hypoplasia 2
    Subependymal heterotopia 2
    Polymicrogyria 2
Extra-axial lesions 
    Intracranial hemangioma 3
    Lipoma 2^a
Other 
    Thin corpus callosum 2
    Ocular abnormality 2^b
    Hippocampal malrotation 2
    Cranial nerve dysplasia (7/8 complex) 1
    Pituitary ectopia 1

a One interhemispheric lipoma was seen in association with callosal dysgenesis; 1 infracollicular lipoma was seen in isolation.

b One case each of coloboma and microphthalmia.

Location	No.
Posterior fossa
Cerebellar hypoplasia	18
Atrophy of cerebral peduncle	2
Malformations of cortical development
Callosal dysgenesis	3
Hemispheric hypoplasia	2
Subependymal heterotopia	2
Polymicrogyria	2
Extra-axial lesions
Intracranial hemangioma	3
Lipoma	2^a
Other
Thin corpus callosum	2
Ocular abnormality	2^b
Hippocampal malrotation	2
Cranial nerve dysplasia (7/8 complex)	1
Pituitary ectopia	1