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Capillary malformation-arteriovenous malformation syndrome

Synonym(s) CM-AVM
Prevalence Unknown
Inheritance Autosomal dominant
or Not applicable
Age of onset Infancy
  • Q27.3
MeSH -
MedDRA -


Disease definition

This syndrome is characterised by the association of multiple capillary malformations (CM) with an arteriovenous malformation (AVM) and arteriovenous fistulas.


So far, it has been described in multiple members of six families.

Clinical description

The CMs are atypical: they are small, round-to-oval in shape and pink-red in colour. AVMs may be cutaneous, subcutaneous, intramuscular, intraosseous or cerebral. The association of CM with arteriovenous fistulas or Parkes-Weber syndrome (see this term) was reported in some cases.


The syndrome is caused by heterozygous mutations in the RASA1 gene (5q13.3), encoding RAS p21 protein activator 1.

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Detailed information

Clinical genetics review
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