X-linked intellectual deficit - cerebellar hypoplasia

Mental retardation and microcephaly with pontine and cerebellar hypoplasia (MICPCH), also known as mental retardation, X-linked, syndromic, Najm type (MRXSNA) and X-linked intellectual deficit, Najm type, is a rare X-linked dominant genetic disorder of infants characterised by intellectual disability and pontocerebellar hypoplasia. It usually affects females; many males die before birth or not long after.The disorder is associated with a mutation in the CASK gene. [Source: Wikipedia ]

Oligophrenin-1 syndrome
OPHN1 syndrome
OrphaNet reference
X-linked intellectual deficit - cerebellar hypoplasia 
May Cause
Cerebellar hypoplasia
Intellectual deficit