Synonyms: Del(4)(q21) | Monosomy 4q21
The 4q21 microdeletion syndrome is a newly described syndrome associated with facial dysmorphism progressive growth restriction severe intellectual deficit and absent or severely delayed speech.
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
Newly diagnosed with
4q21 microdeletion syndrome?
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Advocacy Organizations
Rare Chromosome Disorder Support Group – Unique
Through sharing knowledge and lived experience, Unique helps families and professionals navigate the world of chromosome and gene disorders
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Clinical Trials
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