Autism spectrum disorder in a child with megalencephaly-capillary malformation-polymicrogyria syndrome (MCAP)

Megalencephaly-capillary malformation-polymicrogyria syndrome (MCAP) is a rare disorder that arises as a result of a somatic mosaic mutation in the PIK3CA gene. It characteristically presents with postnatal or congenital megalencephaly, cutaneous capillary malformations, postaxial polydactyly and of...

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Bibliographic Details
Published in:BMJ case reports 2021-12, Vol.14 (12), p.e247034
Main Authors: St John, Lily Je, Rao, Naveen
Format: Article
Language:English
Subjects:
Attention deficit hyperactivity disorder
Autism
Autism Spectrum Disorder - genetics
Capillaries - abnormalities
Case reports
Child
Children & youth
Consent
Humans
Hydrocephalus
Infant
Male
Megalencephaly - diagnostic imaging
Megalencephaly - genetics
Mutation
Orthopedics
Patients
Pediatrics
Physical therapy
Polymicrogyria - diagnostic imaging
Polymicrogyria - genetics
Sleep
Vascular Malformations
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Summary:Megalencephaly-capillary malformation-polymicrogyria syndrome (MCAP) is a rare disorder that arises as a result of a somatic mosaic mutation in the PIK3CA gene. It characteristically presents with postnatal or congenital megalencephaly, cutaneous capillary malformations, postaxial polydactyly and often segmental or focal body overgrowth. We report a 7-year-old boy with known MCAP who was diagnosed at around 10 months old with a mosaic change in the PIK3CA gene. He was found to have hall-mark clinical signs; macrocephaly and four-limb postaxial polydactyly. Since diagnosis, he has had multiple clinical features, most of which typically present in children with MCAP. He has now been diagnosed with autism spectrum disorder (ASD), demand avoidance and is under assessment for attention deficit hyperactivity disorder. Although some cases have been raised to the to our knowledge this is the first case of ASD in MCAP to be reported in the literature.
ISSN:1757-790X
1757-790X
DOI:10.1136/bcr-2021-247034