Anterior third ventricle meningiomas. Report of two cases.

Third ventricle meningiomas are rare, representing approximately 0.15% of all meningiomas. The majority of third ventricular meningiomas are located posteriorly in the pineal region. Less commonly, they arise in the anterior part of the third ventricle. We report the cases of two patients with large and giant meningiomas originating in the anterior part of the third ventricle.