[Cervico-cephalic hemangiomas and vascular malformations. Histopathological appearance and classification].

We present the histological and clinicopathological classification of hemangiomas and vascular malformations, such as was produced by the work of the study group on hemangiomas and vascular malformations of Lariboisière hospital. These lesions can first be classified according to the presence (phasic hemangioma of infants and pyogenic granuloma) or absence (malformations) of active cell proliferation. The malformations are classified according to their histological architecture and to the histological structure of the vessels they are composed of: capillary (hemangioma simplex, telangiectasias, etc.), capillary and/or venous (capillarovenous and cavernous malformations), arterial, venous and capillary (arteriovenous malformations). The classification of lymphatic malformations follows the same principles. The distinctive histological features of the various lesions are illustrated and briefly described.