Midline Arteriovenous Malformation on the Floor of the Third Ventricle

—Successful Removal by Transcallosal Approach: Case Report—

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We treated a patient with an arteriovenous malformation within the third ventricle. The vascular malformation was fed by the right medial posterior choroidal, posterior thalamoperforating, and thalamogeniculate arteries and drained into the vein of Galen. The lesion was approached via the interhemispheric transcallosal route and totally extirpated. The literature concerning arteriovenous malformations involving the ventricular system is reviewed in the context of primary intraventricular hemorrhage, and surgical approaches to the third ventricle are discussed.