[Intravascular vegetating hemangioendothelioma].

In 1928, P. Masson described in hemorrhoids a peculiar lesions which he called "intravascular vegetating hemangioendothelioma". The possibility of cutaneous location of this lesion was demonstrated only in 1967. Rare if isolated, the intravascular vegetating hemangioendothelioma is often associated with other vascular lesions such as polyps, hemorrhoids, etc. Always benign, this tumor may be misdiagnosed as an angiosarcoma by inexperienced pathologists. In this article, three additional cases are described, the histological differences with an angiosarcoma are stressed and the pathogenesis of this lesion is discussed.