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Mosaic trisomy 4

Disease definition

Mosaic Trisomy 4 is a rare autosomal anomaly, due to the presence of an extra copy of chromosome 4 in a fraction of all cells, with a variable phenotype characterized by intrauterine growth retardation, low birth weight/length/OFC, mild intellectual deficit, congenital heart defects, hypertrophic cardiomyopathy, dysmorphic features (asymmetry of the face, eyebrow anomalies, low-set, posteriorally rotated, dysplastic ears, micro-/retrognathia), characteristic thumb abnormalities (aplasia, hypoplasia) and skin abnormalities (hypo/hyperpigmentation). Delayed puberty may be associated.


Classification level: Disorder
  • Synonym(s):
    • Mosaic trisomy chromosome 4
    • Trisomy 4 mosaicism
  • Prevalence: -
  • Inheritance: -
  • Age of onset: Neonatal, Antenatal
  • ICD-10: Q92.1
  • OMIM: -
  • UMLS: -
  • MeSH: -
  • GARD: -
  • MedDRA: -
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