Foramen Magnum Meningioma
Last Updated: September 30, 2018
Meningiomas comprise up to 20% of all intracranial tumors. Although only about 1 to 3% of meningiomas are located at the foramen magnum (FM), this tumor subtype comprises about 75% of all benign, intradural, extramedullary tumors of the cervicomedullary junction.
Like other meningiomas, foramen magnum meningiomas (FMMs) are more frequent in females and rare in children. The neural anatomy around the FM includes the lower cranial nerves, caudal medulla, rostral spinal cord, fourth ventricle, cerebellar tonsils, and inferior vermis. The vascular anatomy includes the vertebral arteries, posterior inferior cerebellar arteries (PICAs), and posterior spinal arteries. Although these structures are vulnerable to mass effect from FMMs, the slow gro...