Vascular anomalies (malformations) are birthmarks or growths made up of blood vessels — capillaries, veins, arteries, lymphatic vessels or any combination of these — that have not properly developed. Many are present at birth, but some do not appear until a child is older. Although they’re relatively common, these abnormal growths can affect your child’s appearance, health and daily function. Some vascular anomalies are quite complex. That is why children with vascular anomalies should be evaluated and treated by an experienced, specialized medical team like the one at AdventHealth for Children. We provide comprehensive, coordinated, interdisciplinary care for all types of vascular anomalies that occur in children, including the following: Arteriovenous malformations (AVM) — abnormal arteries and veins Capillary malformations — abnormal capillaries (also called port-wine stains) Lymphatic malformations — abnormal lymph vessels that can cause swelling and enlarged cysts Venous malformations — abnormal veins