Extra chromosome: In trisomy 18 the patient has an extra chromosome 18. This genetic disorder frequently causes heart and kidney defects. They may have a small head and jaw and usually have severe developmental delay. Here is a link http://www.Trisomy18.Org/site/pageserver?Pagename=whatist18_whatis.
Answered 8/10/2013
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Edwards Syndrome: Trisomy 18 - chromosomal condition in 1/5,000 to 6,000 live births due to random events while egg or sperm form.Usually not inherited. 5 to 10% live past 12 months. May have small jaw, mouth & head, low-set ears, short sternum, heart defects, low birth wt, clenched fists, contracted joints, seizures, scoliosis, spina bifida, high BP, cleft palate & lip, hearing loss & mental retardation.
Answered 7/28/2020
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