Although meningiomas account for almost 20% of brain tumors, only 1.8–3.2% arises at the foramen magnum (FM).1–3 In their monograph on meningiomas, Cushing and Eisen-hardt divided foramen magnum meningiomas into two groups: craniospinal and spinocranial tumors.2 The craniospinal type arose above the foramen magnum ventral to the neuraxis and projected downward, displacing the medulla and cervical spinal cord. The spinocranial type was found dorsal or dorsolat-eral to the spinal cord and projected upward into the posterior fossa cisterns.
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Borba, L.A.B., Colli, B.O. (2009). Foramen Magnum Meningiomas. In: Lee, J.H. (eds) Meningiomas. Springer, London. https://doi.org/10.1007/978-1-84628-784-8_49
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