Costello Syndrome

National Organization for Rare Disorders, Inc.

It is possible that the main title of the report Costello Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.


  • faciocutaneoskeletal syndrome
  • FCS syndrome

Disorder Subdivisions

  • None

General Discussion

Costello syndrome is an extremely rare disorder that affects multiple organ systems of the body. This condition is characterized by growth delays after birth; short stature; extra loose skin on the neck, palms of the hands, fingers, and soles of the feet; noncancerous tumors (papillomata) around the face and anus; developmental delay and intellectual disability; and a characteristic facial appearance. Other physical features may include the development of dry hardened skin on the palms of the hands and the soles of the feet (palmoplantar hyperkeratosis), abnormally deep creases on the palms and soles, and/or abnormally flexible joints of the fingers (hyperextensible). There is an increased incidence of congenital abnormalities of the heart and thickening of the heart muscle called a cardiomyopathy. Characteristic craniofacial features may include an abnormally large head (macrocephaly); course facial features; unusually thick lips; and/or abnormally wide nostrils (nares). Affected individuals have an increased lifetime risk to develop specific malignant tumors. Costello syndrome is an autosomal dominant genetic condition caused by mutations in the HRAS gene.


Human Growth Foundation
997 Glen Cove Avenue
Suite 5
Glen Head, NY 11545
Tel: (516)671-4041
Fax: (516)671-4055
Tel: (800)451-6434

MAGIC Foundation
6645 W. North Avenue
Oak Park, IL 60302
Tel: (708)383-0808
Fax: (708)383-0899
Tel: (800)362-4423

Children's Craniofacial Association
13140 Coit Road
Suite 517
Dallas, TX 75240
Tel: (214)570-9099
Fax: (214)570-8811
Tel: (800)535-3643

March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: (914)997-4488
Fax: (914)997-4763

The Arc
1825 K Street NW, Suite 1200
Washington, DC 20006
Tel: (202)534-3700
Fax: (202)534-3731
Tel: (800)433-5255
TDD: (817)277-0553

Little People of America, Inc.
250 El Camino Real Suite 201
Tustin, CA 92780
Tel: (714)368-3689
Fax: (714)368-3367
Tel: (888)572-2001

American Heart Association
7272 Greenville Avenue
Dallas, TX 75231
Tel: (214)784-7212
Fax: (214)784-1307
Tel: (800)242-8721

Coalition for Heritable Disorders of Connective Tissue (CHDCT)
4301 Connecticut Avenue, NW Suite 404
Washington, DC 20008
Tel: (202)362-9599
Fax: (202)966-8553
Tel: (800)778-7171

International Costello Syndrome Support Group
90 Parkfield Road North
New Moston
Manchester, M40 3RQ
United Kingdom
Tel: 44 161 682 2479

Costello Syndrome Family Network
P O Box 516
Woodinville, WA 98072-0516
Tel: (848)228-2736

Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
TDD: (888)205-3223

Madisons Foundation
PO Box 241956
Los Angeles, CA 90024
Tel: (310)264-0826
Fax: (310)264-4766

RASopathies Network USA
244 Taos Road
Altadena, CA 91001-3953
Tel: (626)676-7694

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, go to and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

For additional information and assistance about rare disorders, please contact the National Organization for Rare Disorders at P.O. Box 1968, Danbury, CT 06813-1968; phone (203) 744-0100; web site or email

Last Updated:  3/4/2014
Copyright  1997, 2001, 2003, 2011, 2014 National Organization for Rare Disorders, Inc.