Trisomy 18 syndrome
There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low birth weight, small head (microcephaly), small jaw (micrognathia), malformations of the heart and kidneys, clenched fists with abnormal finger positioning, and malformed feet. The mental retardation is profound with the IQ too low to even test. Nineteen out of 20 (95%) of these children die before their first birthday. The condition is also called Edwards syndrome in honor of the British physician and geneticist John Edwards who discovered the extra chromosome in 1960.

* * *

a condition characterized by mental retardation, scaphocephaly or other skull abnormality, micrognathia, blepharoptosis, low-set ears, corneal opacities, deafness, webbed neck, short digits, ventricular septal defects, Meckel diverticulum, and other deformities. It is due to the presence of an extra chromosome 18. Called also Edwards or trisomy E s.

Medical dictionary. 2011.

Look at other dictionaries:

  • trisomy E syndrome — trisomy 18 s …   Medical dictionary

  • trisomy 18 — ā(t) tēn n a congenital condition that is characterized esp. by mental retardation and by craniofacial, cardiac, gastrointestinal, and genitourinary abnormalities, is caused by trisomy of the human chromosome numbered 18, and is typically fatal… …   Medical dictionary

  • trisomy 18 — also called  Edwards syndrome        human chromosomal disorder that results from an extra (third) copy of chromosome (chromosome number) 18. Infants born with this disorder are smaller than average and usually do not survive longer than a few… …   Universalium

  • Syndrome, trisomy 18 — There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low birth weight, small head… …   Medical dictionary

  • Syndrome, Edwards — This is trisomy 18 syndrome. There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low… …   Medical dictionary

  • Trisomy — ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D014314A trisomy is a form of aneuploidy with the presence of three copies, instead of the normal two, of a particular chromosome.cite web… …   Wikipedia

  • syndrome — The aggregate of symptoms and signs associated with any morbid process, and constituting together the picture of the disease. SEE ALSO: disease. [G. s., a running together, tumultuous concourse; (in med.) a concurrence of symptoms, fr. syn,… …   Medical dictionary

  • Syndrome de down — « trisomie 21 » redirige ici. Pour les autres significations, voir Trisomie 21 (groupe) …   Wikipédia en Français

  • Syndrome de Down — « trisomie 21 » redirige ici. Pour les autres significations, voir Trisomie 21 (groupe). Syndrome de Down Classification et ressources externes …   Wikipédia en Français

  • Edwards syndrome — This is trisomy 18 syndrome. There are three instead of the normal two chromosomes #18. Children with this condition have multiple malformations and mental retardation due to the extra chromosome #18. The children characteristically have low… …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”