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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
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Demonstration of Cutaneous Allodynia in Association with Chronic Pelvic Pain
06:44

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Published on: June 22, 2009

Visual allesthesia

L Jacobs

    Neurology
    |October 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A patient experienced visual hallucinations and object transpositions due to a brain arteriovenous malformation. Anticonvulsant medication resolved these visual disturbances and seizure activity.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Neurology

    Background:

    • Arteriovenous malformations (AVMs) in the parietooccipital region can cause complex neurological symptoms.
    • Visual disturbances, including hallucinations and perceptual distortions, are reported in some AVM cases.

    Observation:

    • A patient with a right parietooccipital AVM presented with paroxysmal illusory left homonymous transpositions of objects.
    • These palinoptic images persisted for up to 15 minutes and were associated with left homonymous hemiachromatopsia.
    • Episodes of visual allesthesia occurred with other seizure manifestations.

    Findings:

    • The patient had a right parietooccipital epileptogenic focus.
    • Anticonvulsant medication successfully eliminated electroencephalographic epileptogenic activity and all seizure symptoms, including visual allesthesias.
    • Palinoptic images and visual allesthesia may stem from interhemispheric transfer to an irritated parietooccipital lobe.

    Implications:

    • Cerebral irritation and seizures are key to visual allesthesia.
    • This case highlights the link between epileptogenic activity in the parietooccipital lobe and complex visual phenomena.
    • Understanding these mechanisms can inform AVM treatment and management strategies for visual disturbances.