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Cranial and Spinal Meninges

Cranial and Spinal Meninges

The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
Cranial Meninges
These meningeal layers cover the cranium. The dura mater is the outermost layer of cranial meninges. It is a thick and durable membrane of dense...

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Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery

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Extra-axial brain tumors.

Otto Rapalino¹, James G Smirniotopoulos²

¹Division of Neuroradiology, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA.

Handbook of Clinical Neurology

|July 20, 2016

Summary

This summary is machine-generated.

Extra-axial brain tumors are common adult intracranial neoplasms. This overview covers common types like meningiomas and their imaging features, distinguishing them from other dural-based masses.

Keywords:

dural-based mass extra-axial brain tumor meningiomas metastasis neurofibroma peripheral nerve sheath tumors schwannoma solitary fibrous tumor

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Area of Science:

Neurology
Neurosurgery
Radiology

Background:

Extra-axial brain tumors are the most frequent adult intracranial neoplasms, presenting diverse pathologic subtypes.
Meningiomas, the most common type, are typically slow-growing, dural-based masses, often benign but sometimes challenging to distinguish from aggressive subtypes or other dural masses.
Intra-axial tumors like gliomas can also exhibit extra-axial involvement.

Purpose of the Study:

To provide a concise overview of common extra-axial brain tumor types.
To describe the typical imaging features of these neoplasms.
To aid in differentiating various dural-based masses.

Main Methods:

Review of common extra-axial tumor pathology.
Description of characteristic imaging findings.
Comparative analysis of differential diagnoses for dural-based lesions.

Main Results:

Meningiomas constitute approximately one-third of all intracranial neoplasms.
Distinguishing benign meningiomas from atypical/malignant subtypes and other aggressive dural masses (e.g., hemangiopericytoma, metastases) can be challenging.
Gliomas may present with extra-axial involvement.

Conclusions:

Extra-axial tumors represent a significant category of adult brain neoplasms.
Understanding imaging features is crucial for accurate diagnosis and differentiation.
This overview serves as a guide to common extra-axial tumor presentations.