What Is a Venous Aneurysm?

Galen's venous aneurysm is also called a large cerebral venous tumor; Galen's venous aneurysm-like malformation. It is a rare cerebral arteriovenous malformation. The main pathological change is a short circuit between the cerebral arteries and the cerebral veins, which makes the large cerebral veins extremely dilated and round, and the vein walls are gray, thickened, and tough, often exceeding 3 cm in diameter. The main blood supply comes from one or both posterior cerebral arteries and their branches. Branches of the middle cerebral artery are also often involved in supplying blood. The classification of Galen's venous tumor is: True Galen's venous tumor: Congenital, formed during the third month of the embryo, the tumor sac is not the Galen's venous tumor itself, but the long vein in the forebrain, with one or more supply arteries It is directly connected with the wall of the large vein of the brain; Pseudo-Galen venous tumor: It is a cerebral arteriovenous malformation accompanied by Galen's venous tumor-like dilatation, which is caused by secondary or acquired output vein embolism. ^[1]