Related Experiment Video
Updated: May 2, 2026
05:44
Author Spotlight: Double Posteromedial Approach for Treating Posterior Cruciate Ligament Cysts
Published on: October 20, 2023
2.0K
Diverse arachnoid cyst morphology indicates different pathophysiological origins.
Katrin Rabiei1, Magnus Tisell, Carsten Wikkelsø
1Institute of Neuroscience and Physiology, c/o Neurosurgical Clinic, Sahlgrenska University Hospital, Gothenburg SE-413 45, Sweden. katrin.rabiei_tabriz@vgregion.se.
Fluids and Barriers of the CNS
|March 4, 2014
Summary
Arachnoid cysts exhibit diverse cellular structures, with some resembling normal membranes and others showing aberrant epithelia and neural tissue. This heterogeneity suggests varied origins and barrier properties, impacting clinical behavior.
Area of Science:
- Neurosurgery
- Pathology
- Developmental Biology
Background:
- Limited and contradictory reports exist on arachnoid cyst cellular and subcellular morphology.
- Cyst membranes are variably described as similar to or different from normal arachnoid membranes.
Purpose of the Study:
- To investigate the cellular and subcellular morphology of symptomatic arachnoid cysts.
- To understand the diverse nature and potential origins of arachnoid cysts.
Main Methods:
- Electron microscopic analysis of symptomatic arachnoid cysts from 24 patients.
- Analysis of cysts from various locations including the middle cranial fossa, interpeduncular cistern, posterior fossa, and frontal cortex.
Main Results:
- Cyst walls showed diverse morphologies: 12 resembled normal arachnoid, 4 had dense fibrous tissue with epithelial lining, and others displayed non-arachnoid epithelia with microvilli/cilia and neural tissue.
- Findings confirm the heterogeneous nature of arachnoid cysts.
- Hypothesized that cysts often form early in embryonic development as teratological events.
Conclusions:
- Varied cyst linings and components suggest differing barrier properties and fluid turnover.
- Further research is needed to link cyst morphology, fluid composition, pathogenesis, and clinical behavior (growth, relapse).
Related Concept Videos
01:22Cerebral Edema ll: Pathophysiology
19
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...
19
01:30Aneurysm I: Introduction
650
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...
650
01:26Brain Abscess l: Introduction
21
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...
21
01:19Cranial and Spinal Meninges
4.5K
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...
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...
4.5K
01:19Cerebral Edema l: Introduction
30
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...
30
01:26Bacterial Meningitis II: Pathophysiology
24
Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
24