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Cranial and Spinal Meninges

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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).
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Related Experiment Video

Updated: Dec 17, 2025

Endoscopic Approach for Colloid Cyst Resection

Endoscopic Approach for Colloid Cyst Resection

Published on: May 23, 2025

Clinoidal meningiomas.

M Necmettin Pamir¹, Koray Özduman¹

¹Department of Neurosurgery, Acıbadem University, School of Medicine, Istanbul, Turkey.

Handbook of Clinical Neurology

|June 27, 2020

Summary

This summary is machine-generated.

Clinoidal meningiomas, tumors near the anterior clinoid process, often compress the optic nerve, causing early visual symptoms. Surgical removal typically improves vision, with good outcomes and low risks, though recurrences may require radiosurgery.

Keywords:

Anterior clinoid process Clinoidal meningioma Meningioma Microsurgery

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Area of Science:

Neurosurgery
Oncology
Ophthalmology

Background:

Clinoidal meningiomas originate at the anterior clinoid process, exhibiting distinct anatomopathologic features and clinical behaviors.
These tumors can be subclassified into three groups based on origin, influencing presentation and surgical results.
Hyperostosis of the anterior clinoid process is common, often leading to optic nerve compression and early visual disturbances.

Purpose of the Study:

To characterize the clinical behavior, surgical management, and outcomes of clinoidal meningiomas.
To investigate the relationship between tumor characteristics, surgical approaches, and patient outcomes.
To identify factors influencing visual recovery and recurrence rates.

Main Methods:

Review of clinoidal meningioma cases managed surgically.
Analysis of surgical approaches including extradural, intradural, standard, minimal invasive, and skull base techniques.
Evaluation of pre- and post-operative visual status, neurovascular invasion, and recurrence patterns.

Main Results:

Most clinoidal meningiomas present with optic nerve compression and visual symptoms, which often improve after surgery.
Surgical resection, frequently involving anterior clinoidectomy, yields good results with low mortality and morbidity.
Cavernous sinus invasion is infrequent, but invasion of the internal carotid artery or distal branches increases the risk of residual tumor.

Conclusions:

Clinoidal meningiomas require tailored surgical approaches, often including anterior clinoidectomy, with generally favorable outcomes.
Early visual symptoms are common but often reversible with timely surgical intervention.
Recurrences can occur and are typically managed effectively with Gamma-Knife radiosurgery.