This syndrome is characterised by the association of multiple capillary malformations (CM) with an arteriovenous malformation (AVM) and arteriovenous fistulas.Last update: April 2008
So far, it has been described in multiple members of six families.
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.