[Classification of vascular tumors and malformations: basis for classification and clinical purpose].

Vascular anomalies are a complex pathological group. They are especially difficult to study because of confusion in the terminology used. The classification developed by the ISSVA (International Society for the Study of Vascular Anomalies) now allows using a common scientific language. The classification is based on clinical, radiological, hemodynamic, and histological arguments. There are two groups of lesions: vascular tumors and vascular malformations. Vascular tumors are associated to vascular proliferation. They are called hemangioma and can be infantile or congenital. Vascular malformations are associated to vessels with morphologic anomalies. They are classified according to the distorted vessel type, capillary, venous, lymphatic, and arteriovenous). Such a classification has many implications. It is a guide for the orientation of radiological exams and treatment of vascular anomalies. The management of these anomalies is still difficult and must involve an interdisciplinary approach.