Vascular malformations are congenital vascular anomalies with normal endothelial turnover, which can affect the whole vessel tree (arterial, capillary or lymphatic) both as isolated defects or as part of a syndrome. Developmental errors during embryogenesis, such as abnormal signaling processes that control the apoptosis, maturation and growth of vascular cells, lead to the persistence of vascular plexus cells with some degree of differentiation. Vascular malformations are usually present at birth, although symptoms or complications may be manifested later. Since the overwhelming majority are symptomatic, treatment is indicated which is often aimed only at improving the symptoms by controlling the size.