This is a peripheral connection between an artery and a vein . It can be caused by a penetrating trauma (e.g. venepuncture), neoplasia, a mass ligation of vessels during surgery, aneurysmal rupture or the erosion of vessels by infection. | This is a peripheral connection between an artery and a vein . It can be caused by a penetrating trauma (e.g. venepuncture), neoplasia, a mass ligation of vessels during surgery, aneurysmal rupture or the erosion of vessels by infection. |