Trisomy 18From our partner site on heart disease, MyHeartCentral.com.
Trisomy 18 is a syndrome associated with the presence of a third (extra) number 18 chromosome. Alternative Names: Edwards syndrome Causes, incidence, and risk factors: Trisomy 18 is a relatively common syndrome affecting approximately 1 out of 3,000 live births, and affecting girls more than three times as often as boys. It is caused by the presence of an extra number 18 chromosome, which leads to multiple abnormalities. Many of these abnormalities make it hard for infants to live longer than a few months.
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