[Classification of angiodysplasias and vascular tumors]

Numerous vascular dysplasiae belong to the group of genodysplasiae. Most arteriovenous dysplasiae (cirsoid, racemosum aneurysms,...) are the substratum of various regional "angiomatosis". Stenotic or ectatic arterial dysplasiae can be associated with genodysplasiae. In addition, lymphatic dysplasiae (congenital elephantiasis, etc...) also exist. Among benign tumours, angiomas are sometimes hardly distinguishable from dysplasiae. Some tumors with intermediate malignancy have an uncertain prognosis: chemodectoma, hemangiopericytoma. As for malignant vascular tumours, they fall into 3 varieties: angiosarcoma, Kaposi's sarcoma and sarcoma of vascular walls.