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Monosomy 21

What is Monosomy 21?

Monosomy 21 is a chromosomal anomaly characterized by the loss of variable portions of a segment of the long arm of chromosome 21 that leads to an increased risk of birth defects, developmental delay and intellectual deficit.

Other condition names

  • 21q deletion syndrome
  • 21q- syndrome
  • Partial 21q monosomy

Prevalence

  • Worldwide: <1 in 1,000 000

Age of Onset

  • Antenatal
  • Neonatal
Orphadata: Free access data from Orphanet. © INSERM 1999. Available on "https://www.orphadata.com". Data version 1.3.16 / 4.1.7.