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Genetic and Rare Diseases Information Center (GARD)

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Costello syndrome

Other Names for this Disease
  • Faciocutaneoskeletal syndrome
  • FCS syndrome
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Costello syndrome is characterized by delayed development and intellectual disability, distinctive facial features, loose folds of extra skin (especially on the hands and feet), and unusually flexible joints. Heart abnormalities are common, including an unusually fast heartbeat (tachycardia), structural heart defects, and a form of heart disease that enlarges and weakens the heart muscle (hypertrophic cardiomyopathy). Beginning in early childhood, people with Costello syndrome are at an increased risk of developing certain cancerous and noncancerous tumors. Costello syndrome is caused by mutations in the HRAS gene. It is considered an autosomal dominant condition, but almost all reported cases have resulted from new gene mutations and have occurred in people with no history of the disorder in their family.[1]

The signs and symptoms of Costello syndrome overlap significantly with those of two other genetic conditions, cardiofaciocutaneous (CFC) syndrome and Noonan syndrome. While the three conditions are distinguished by their genetic cause and specific patterns of signs and symptoms, it can be difficult to tell them apart in infancy.[1]

Last updated: 5/24/2011


  1. Costello syndrome. Genetics Home Reference (GHR). 2008; Accessed 1/13/2011.
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Basic Information

  • Genetics Home Reference (GHR) contains information on Costello syndrome. This website is maintained by the National Library of Medicine.
  • The National Organization for Rare Disorders (NORD) is a federation of more than 130 nonprofit voluntary health organizations serving people with rare disorders. Click on the link to view information on this topic.

In Depth Information

  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Costello syndrome. Click on the link to view a sample search on this topic.