Steep aortic arch (such as Type III arch) and small angle between the chimney artery and aortic arch are two anatomic conditions suitable for chimney grafts (CGs). The more the number of chimneys. the higher the incidence of endoleak and branch occlusion; thus. the triple-chimney technique should be avoided unless the lesion involves zone 0 and no other better option is available. https://www.ngetikin.com/