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Trisomy 18p is an extremely rare chromosomal anomaly with a poorly defined clinical phenotype. Reported manifestations include short stature, mild, moderate or severe developmental delay and intellectual disability, variable but mild facial dysmorphism, and epilepsy.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for trisomy 18p.
5 publications have been identified in PubMed for trisomy 18p. Research spans Case Report / Case Series (60%) and Basic Science / Preclinical (40%).
Deng G (2026). [PMID: 41658620](https://pubmed.ncbi.nlm.nih.gov/41658620/). *Front Med (Lausanne)*. [Case Report / Case Series]
Wakabayashi H (2025). [PMID: 40447572](https://pubmed.ncbi.nlm.nih.gov/40447572/). *Hum Genome Var*. [Case Report / Case Series]
Wright CA (2025). [PMID: 39924478](https://pubmed.ncbi.nlm.nih.gov/39924478/). *Mol Cytogenet*. [Basic Science / Preclinical]
Vormittag-Nocito E (2025). [PMID: 40239807](https://pubmed.ncbi.nlm.nih.gov/40239807/). *Mod Pathol*. [Basic Science / Preclinical]
Ardisia C (2024). [PMID: 39596664](https://pubmed.ncbi.nlm.nih.gov/39596664/). *Genes (Basel)*. [Case Report / Case Series]
Data assembled from 3 of 12 sources · Last updated Sep 18, 2026, 9:39 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
AI-curated news mentioning trisomy 18p
Updated Sep 15, 2026
A recent study evaluates the impact of screening programs on the prenatal diagnosis rates of trisomy 13 and 18 over 30 years. The findings highlight trends in detection rates, providing insights for future screening strategies.
A case study highlights a complex mosaic form of trisomy 18 and monosomy X in a girl with esophageal atresia and mild developmental delay. This research underscores the diagnostic and therapeutic challenges associated with such rare chromosomal abnormalities.
A rare case report details a patient with trisomy 18 who also presented with complete bilateral radial aplasia. This finding contributes to the understanding of the phenotypic spectrum associated with trisomy 18.