Meningiomas are the most common benign intracranial tumors. They originate from cells (arachnoid cap cells) within the arachnoid, a thin, spider web-like membrane that surrounds the brain and spinal cord. There are three layers of meninges; the dura mater, arachnoid and pia mater. Although the majority of meningiomas are benign, undiscovered these tumors can grow slowly until they are very large, and in some locations, can be severely disabling and even life threatening. Most patients develop a single meningioma, however, some patients may develop several tumors growing simultaneously in other parts of the brain or spinal cord.

Meningiomas are found along the dura lining the venous sinuses of the brain and skull base; locations where arachnoid cap cells are most abundant. Therefore, intracranial meningiomas are commonly found at the cerebral convexity, parasagittal/falx, petrous ridge, sphenoid wing, tentorium, foramen magnum, cerebellopontine angle, and cavernous sinus.

In the spine, meningiomas are typically located in the intradural extramedullary space and spread laterally into the subarachnoid space, most frequently in the thoracic region.

Meningiomas Overview

  • Prevalence and Incidence

  • Risk Factors

  • Symptoms

  • Types and Classification

  • Diagnosis

  • Treatment Options

  • Typical Outcome


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