Vascular anomalies (Birthmarks) consist of various congenital lesions, which can be grouped as hemangiomas and vascular malformations.

Hemangiomas include infantile hemangioma, rapidly involuting congenital hemangioma (RICH), kaposiform hemangioendothelioma (KHE), non-involuting hemangioma and intramuscular hemangioma.

Vascular malformations are further grouped as slow-flow malformations, fast-flow malformations and complex vascular malformations. Slow-flow malformations include capillary malformation (CM) (port-wine stain), venous malformation (VM), lymphatic malformation (VM) and lymphatic-venous malformation (LVM). Fast-flow malformations include arteriovenous malformation (AVM) and arteriovenous fistulas (AVF).

Complex vascular malformations include Klippel-Trenaunay syndrome, Proteus syndrome, Maffucci syndrome, Parkes-Weber syndrome and other rare anomalies.

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