In these situations, a venous tactic, if retrograde venous catheterization, is possible or immediate punctures in the nidus is usually done. Reducing the inflow through the first couple arterial periods can make these two possibilities probable, safer, and easier to perform. Aneurysm. This is a balloon-like bulge in the walls https://sgvasculargrp.com/medical-condition/vascular-malformations/