Trisomy 18, also known as Edwards syndrome, is a condition which is caused by a chromosomal defect. It is considered lethal or has a very poor prognosis in all cases. 50% of affected infants born alive (most result in miscarriage in the early stages of pregnancy) will die in the first 2 months of life and 90% will die in the first year. All survivors with full trisomy 18 have profound mental retardation.
A great website to get more information about this condition is www.trisomy18.org
Also, www.trisomy.org is a support organization for parents who have had or are expecting a child with a chromosome disorder (especially trisomy 18 or trisomy 13).
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