Macrocephaly-developmental delay syndrome is a rare intellectual disability syndrome characterized by macrocephaly mild dysmorphic features (frontal bossing long face hooded eye lids with small downslanting palpebral fissures broad nasal bridge and prominent chin) global neurodevelopmental delay behavioral abnormalities (e.g. anxiety stereotyped movements) and absence or generalized tonic-clonic seizures. Additional features reported in some patients include craniosynostosis fifth finger clinodactyly recurrent pneumonia and hepatosplenomegaly.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
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Macrocephaly-developmental delay syndrome?
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Advocacy Organizations
PPP2CA Pathways
PPP2CA Pathways connects families, shares strength, and supports the research community in the search for answers to Houge-Janssens Syndrome type 3.
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Clinical Trials
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