Female, 42 years old, with prior subarachnoid hemorrhage similar to AVM, pretreatment planning. A tangle of enhancing vessels is demonstrated involving the left thalamus and posterior third ventricular region with an enlarged vein which drains to the vein of Galen. The tissues surrounding this lesion are T2 hypointense indicating hemosiderin staining. Patchy hemosiderin staining is also seen along the ventricular margins compatible with prior intraventricular hemorrhage. The ventricles are of normal caliber. Evidence of prior right frontal approach ventriculostomy is seen.
Findings are seen compatible with an AVM involving the left thalamus and third ventricular region. Sequelae of prior hemorrhage are also seen.