Encephaloduroarteriosynangiosis, or encephalo-duro-arterio-synangiosis [1] (abbreviated EDAS, encephalo-, of the brain; duro- , hard; arterio- , of the artery; synangial, relating to the synangium) is a neurosurgical procedure performed to treat moyamoya syndrome. [2] [3] [4]
[EDAS] is a form of revascularization that has shown promising early results in the treatment of adult patients with moyamoya disease [and, more recently,] in patients with intracranial atherosclerotic steno-occlusive disease (ICASD).
EDAS reroutes a section of an artery that is normally connected to the scalp onto the surface of the brain. New blood vessels grow from this artery into the brain itself. The goal [is] to provide a new source of blood for an ischemic area of the brain. [It] is performed to treat a condition of progressively restricted blood flow to the brain known as moyamoya. [It belongs to a group of] procedures termed indirect revascularization procedures [,] in which the brain grows vessels from a new blood supply. [This group of procedures are] performed most often in children [and can be performed on adults, though they] are more commonly treated with a form of direct revascularization called EC-IC bypass.
[EDAS] involves the transposition of a segment of a scalp artery onto the surface of the [brain. Such surgical] treatment [is] aimed at improving collateral blood flow.