Font Size Increase (+) Default Decrease (-)

A Ministry of Fraciscan Sisters of Allegany

Services  |  Find a Doctor  |  Classes & Events  |  Patient/Visitor Info  |  Careers  |  Contact Us







Health Articles & Symptom Checker


Search Health Information   
 

Trisomy 18

Definition

Trisomy 18 is a genetic disorder in which a person has a third copy of material from chromosome 18, instead of the usual two copies.

Alternative Names

Edwards syndrome

Causes

Trisomy 18 occurs in 1 in 6,000 live births. It is three times more common in girls than boys.

The syndrome occurs when there is extra material from chromosome 18. The extra material affects normal development.

Symptoms


Exams and Tests

An exam during pregnancy may show an unusually large uterus and extra amniotic fluid. There may be an unusually small placenta when the baby is born.

A physical exam of the infant may show unusual fingerprint patterns. X-rays may show a short breast bone. Chromosome studies will show trisomy 18, partial trisomy, or translocation.

Other signs include:

There are often signs of congenital heart disease, such as:

Tests may also show kidney problems, including:

Treatment

There are no specific treatments for trisomy 18. Which treatments are used depend on the patient's individual condition.

Support Groups


Outlook (Prognosis)

Half of infants with this condition do not survive beyond the first week of life, and 90% of the children will die by one year of age. Some children have survived to the teenage years, but with serious medical and developmental problems.

Possible Complications

Complications depend on the specific defects and symptoms.

When to Contact a Medical Professional

Genetic counseling can help families understand the condition, the risks of inheriting it, and how to care for the patient.

Prevention

Tests can be done during pregnancy to find out if the child has this syndrome.

Genetic testing is recommended for parents who have a child with this syndrome and who want to have more children.

References

Summar K, Lee B. Cytogenetics. In: Kliegman RM, Stanton BF, St. Geme JW III, Shor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 76.


Review Date: 9/8/2013
Reviewed By: Chad Haldeman-Englert, MD, FACMG, Wake Forest School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
adam.com
 


St. Joseph's Children's Hospital of Tampa • 3001 W. Dr. Martin Luther King Jr. Blvd. • Tampa, FL 33607 • (813) 554-8500