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Capillary malformation/arteriovenous malformation (CM-AVM) syndrome is a rare disorder of the vascular (blood vessel) system.
The syndrome is caused by a mutation in the RASA-1 gene, which functions in the development of the vascular system. The mutation can be passed down from a parent or occur by chance. It may take different forms in affected family members with some having only small vascular birthmarks and others developing significant vessel malformations.
Capillary malformations (CM) — characterized by flat reddish or purple patches on the face, arms and/or legs — do not usually cause health concerns. However, they can be a marker for other vascular malformations elsewhere in the body. In CM-AVM syndrome, patients may develop CMs that are atypical in color, number and location and may also form arteriovenous malformations (AVM). AVMs involve improper connections between arteries and veins and can cause serious, sometimes life-threatening health problems.
CM-AVM syndrome is a complex condition that should be assessed and diagnosed by a physician who specializes in vascular anomalies. Patients as well as family members may undergo diagnostic testing including:
Treatment for arteriovenous malformations found in patients with CM-AVM syndrome depends on the area of the body that is involved and can include:
The vascular anomalies program at Comer Children's offers an integrated and comprehensive approach to the diagnosis, care and management of vascular malformations. Our multidisciplinary team of pediatrics experts works together to educate families and to evaluate and treat children with all types of these vascular lesions.