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Related Concept Videos

Cranial and Spinal Meninges01:19

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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A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial infections,...
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Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
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Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
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Related Experiment Video

Updated: Jul 10, 2026

Lateral Molar Approach-Driven Transoral Endoscopic Procedure for Benign Infratemporal Fossa Tumor Resection
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Primary intraosseous meningioma.

James B Elder1, Roscoe Atkinson, Chi-Shing Zee

  • 1Department of Neurosurgery, University of Southern California, Los Angeles, California, USA.

Neurosurgical Focus
|October 27, 2007
PubMed
Summary

Primary intraosseous meningiomas, rare skull bone tumors, are a distinct subtype of extradural meningiomas. This review summarizes existing literature on their classification, presentation, and treatment, highlighting a need for further research.

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Area of Science:

  • Neurosurgery
  • Oncology
  • Pathology

Background:

  • Primary intraosseous meningiomas are rare tumors originating in the skull bones, distinct from typical intradural meningiomas.
  • They constitute a significant portion of extradural meningiomas but are infrequently studied, with limited literature available.

Observation:

  • These tumors present unique clinical and radiographic features due to their location within the bone.
  • Classification relies on anatomical site and histopathological findings.
  • Surgical resection with wide margins is the primary treatment modality.

Findings:

  • The existing literature predominantly consists of clinical case reports and series.
  • There is a scarcity of data regarding the efficacy of adjuvant therapies like radiation and chemotherapy for these specific tumors.

Implications:

  • Further research is needed to establish evidence-based guidelines for adjuvant therapies in primary intraosseous meningiomas.
  • Understanding the distinct characteristics of these tumors is crucial for accurate diagnosis and effective management.
  • This review synthesizes current knowledge, identifying gaps for future investigation.