Neurodevelopmental and neurological features in children with hypochondroplasia
Megan F Baxter1,2, Rhoda Akilapa1, Alessandra Cocca3
1Department of Genetics, Guy's and St Thomas' Hospital NHS Foundation Trust, London, UK.
Developmental Medicine and Child Neurology
|August 7, 2026
Summary
Children with hypochondroplasia show significant neurodevelopmental and neurological issues, including high rates of hippocampal malrotation (HIMAL). This highlights the need for enhanced developmental surveillance and clinical guidelines for this genetic condition.
Area of Science:
- Pediatric Neurology
- Skeletal Dysplasias
- Neurodevelopmental Disorders
Background:
- Hypochondroplasia is a skeletal dysplasia often associated with genetic factors.
- Limited data exists on the comprehensive neurodevelopmental and neurological profile of affected children.
Purpose of the Study:
- To evaluate neurodevelopmental outcomes, neurological features, and neuroimaging abnormalities in children with molecularly confirmed hypochondroplasia.
Main Methods:
- Retrospective cohort study of 44 children with molecularly confirmed hypochondroplasia.
- Data included clinical characteristics, neuroimaging, special educational needs, and diagnosed neurodevelopmental disorders.
- Statistical comparisons with UK population prevalence were conducted.
Main Results:
- 23 out of 25 children (92%) with brain imaging showed hippocampal malrotation (HIMAL).
- 71% required special educational support, and 29% had Education, Health, and Care Plans (EHCPs), significantly higher than population norms.
- 20.5% had diagnosed neurodevelopmental disorders, with higher rates of specific learning disorders, autism, and ADHD.
Conclusions:
- Hypochondroplasia is linked to a significant burden of neurodevelopmental and neurological abnormalities.
- A high prevalence of HIMAL was observed, exceeding previous estimates.
- Findings emphasize the need for clinical guidelines, developmental surveillance, and research into FGFR3-related brain development.
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