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Indications and Preoperative Considerations Meningiomas represent 34% of all primary brain tumors, originate from the arachnoid cells in the brain and spine and are histologically non-cancerous lesions. Anterior midline meningiomas can be classified according to their location ( Figure 31.1…
Preoperative Considerations Chordomas are locally aggressive neoplasms that arise from embryonic remnants of the notochord along the vertebral axis. They represent less than 1% of all intracranial neoplasms. They can be divided in three groups according to their location: Cranial…