A congenital abnormality in which the meninges protrude through a defect in the spinal column or the cranium.
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polymicrogyria
MONDO:0000087
congenital myasthenic syndrome with tubular aggregates
MONDO:0000182
prenatal-onset spinal muscular atrophy with congenital bone fractures
MONDO:0000209
anencephaly
MONDO:0000819
cerebral cavernous malformation
MONDO:0000820
progressive external ophthalmoplegia
MONDO:0005181