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Epidural Intracranial Pressure Measurement in Rats Using a Fiber-optic Pressure Transducer
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Dynamic Nature of Arachnoid Granulations During Acute Changes in Intracranial Pressure: A Pilot Study

Andrew Wai Kei Ko1, Dipakkumar Thakor1, Nada Aboudahab1

  • 1Department of Radiology, George Washington University Hospital, Washington, DC, USA.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|October 27, 2025
PubMed
Abstract

Keywords:
arachnoid granulationscerebrospinal fluidextraventricular drainhydrocephalusintracranial pressure

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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...
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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...
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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...