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Distal trisomy 9q is a rare chromosomal anomaly, resulting from the partial trisomy of the long arm of chromosome 9, with a variable phenotype mostly characterized by psychomotor and speech delay, intellectual disability, hypotonia, long narrow habitus, craniofacial dysmorphism (incl. micro/dolichocephaly, facial asymmetry, narrow palpebral fissures, deep-set eyes, strabismus, microphthalmia, abnormally shaped ears, microstomia, micro/retrognathia) and hand and feet anomalies (incl. arachnodactyly, camptodactyly, abnormal implantation of digits). Congenital flexion contractures and limited joint movements have also been observed.
No clinical trials have been registered for distal trisomy 9q.
2 publications have been identified in PubMed for distal trisomy 9q. Research spans Case Report / Case Series (50%) and Basic Science / Preclinical (50%).
Fujii S (2025). [PMID: 38949851](https://pubmed.ncbi.nlm.nih.gov/38949851/). *Blood Transfus*. [Case Report / Case Series]
Wright CA (2025). [PMID: 39924478](https://pubmed.ncbi.nlm.nih.gov/39924478/). *Mol Cytogenet*. [Basic Science / Preclinical]
Data assembled from 3 of 12 sources · Last updated Sep 20, 2026, 8:40 AM UTC
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