Percutaneous transvenous catheterization and embolization of vein of galen aneurysms.

Seven cases of vein of Galen aneurysms treated by percutaneous transvenous endovascular occlusion of the aneurysmal vein are presented. In one case, the approach was via the femoral vein, and in the other six cases, by the jugular vein. All of the malformations were multipedicular and, additionally, in six of the seven there was an intervening arterial-arterial network between the posterior thalamoperforating arteries and the wall of the venous aneurysm. This fistulous network was interpreted as purely arterial and not as an associated arteriovenous malformation. For this reason, the transvenous approach was considered justified, and was performed without risk of hemorrhage caused by retrograde venous hypertension. Measurement of intra-aneurysmal pressure during the course of treatment allowed better understanding of the hemodynamics of the lesions, guided the amount of occlusion to be accomplished during each treatment session, and thus may have prevented the phenomenon of normal perfusion pressure breakthrough. The percutaneous transvenous approach offers all the advantages of the transtorcular approach but avoids surgery. Because of our excellent angiographic and clinical results--five complete and two partial occlusions, with favorable outcomes and no major complications--we believe that this technique is better for the treatment of multipedicular vein of Galen aneurysms than transarterial embolization or surgery.