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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
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An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Glaucoma: Overview01:25

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Increased Intracranial Pressure l: Introduction01:14

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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: Jun 21, 2026

Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct
11:49

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Published on: January 22, 2010

[Papilloedema: true or false?].

S Muñoz1, N Martín

  • 1Servicio de Oftalmologia, Hospital Universitari de Bellvitge, l'Hospitalet de Llobregat, Barcelona. silviamq@terra.es

Neurologia (Barcelona, Spain)
|July 16, 2009
PubMed
Summary
This summary is machine-generated.

Diagnosing papilledema (optic nerve swelling) can be challenging. Advanced ophthalmologic imaging techniques like optical coherence tomography and fluorescein angiography aid in differentiating true papilledema from pseudopapilledema.

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Area of Science:

  • Ophthalmology
  • Neuro-ophthalmology

Context:

  • Papilledema diagnosis presents challenges, requiring differentiation from optic neuropathies and pseudopapilledema.
  • Pseudopapilledema is often caused by optic disc drusen, necessitating specific diagnostic approaches.

Purpose:

  • To evaluate the utility of advanced ophthalmologic imaging in diagnosing papilledema.
  • To differentiate true papilledema from pseudopapilledema and other optic disk swellings.

Summary:

  • Optical coherence tomography (OCT) provides detailed retinal nerve fiber layer thickness measurements for detecting subtle optic nerve changes.
  • Eye ultrasonography is crucial for identifying optic disc drusen, a common cause of pseudopapilledema.
  • Fluorescein angiography helps assess retinal vessel permeability, aiding in distinguishing true papilledema from other conditions.

Impact:

  • These low-invasive techniques facilitate early and accurate diagnosis of papilledema.
  • They assist in ruling out pseudopapilledema and optic disk swelling secondary to other neuropathies.
  • Improved diagnostic capabilities enhance patient management and follow-up for optic nerve conditions.