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Related Concept Videos

Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

31
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...
31
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

71
DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic...
71
Cerebral Edema l: Introduction01:19

Cerebral Edema l: Introduction

35
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...
35
Cytotoxic Edema: Pathophysiology01:21

Cytotoxic Edema: Pathophysiology

31
Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous...
31
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

32
Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
32
Increased Intracranial Pressure ll: Pathophysiology01:29

Increased Intracranial Pressure ll: Pathophysiology

43
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...
43

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Related Experiment Video

Updated: May 6, 2026

Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
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Hypertensive encephalopathy with reversible brainstem edema.

Sungjoon Lee1, Byung-Kyu Cho, Hoon Kim

  • 1Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.

Journal of Korean Neurosurgical Society
|November 1, 2013
PubMed
Summary

Hypertensive brainstem encephalopathy, a rare condition, can cause brainstem edema and bleeding due to high blood pressure. Prompt blood pressure reduction is key to recovery and preventing neurological damage.

Keywords:
Brain stemEdemaEncephalopathyHypertension

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Area of Science:

  • Neurology
  • Radiology
  • Cardiology

Background:

  • Arterial hypertension is a common condition with various neurological complications.
  • Brainstem involvement in hypertensive emergencies is less understood than other brain regions.

Observation:

  • A 36-year-old male with hypertension presented with brainstem edema and intracranial hemorrhage.
  • MRI revealed diffuse brainstem hyperintensity (T2/FLAIR) and increased ADC values.

Findings:

  • The patient experienced rapid resolution of brainstem edema following blood pressure reduction.
  • The condition was diagnosed as hypertensive brainstem encephalopathy, likely vasogenic.

Implications:

  • Early recognition and aggressive antihypertensive treatment are crucial.
  • This case highlights the importance of managing blood pressure to prevent severe neurological injury.