Synonyms: Dup(20p) | Duplication of 20p | Partial duplication of chromosome 20p | Partial duplication of the short arm of chromosome 20 | Partial trisomy of chromosome 20p | Partial trisomy of the short arm of chromosome 20
Trisomy 20p is a chromosomal disorder resulting from duplication of all or part of the short arm of chromosome 20. It is mostly characterized by normal growth mild to moderate intellectual disability speech delay poor coordination and evocative facial features.
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
Trisomy 20p?
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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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