The Clinical Problem Solvers Episode 323: Neurology VMR – Visual Hallucinations
Mar 7, 2024
A lively dive into causes of visual hallucinations, from structural lesions and seizures to Charles Bonnet syndrome and psychiatric mimics. They explore monocular versus binocular localization and occipital lobe seizure presentations. Discussion covers imaging and EEG challenges, risk factors like hyperglycemia and alcohol, and bedside exam clues for localizing visual phenomena.
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Peduncular Hallucinosis Produces Vivid Scenes
- Peduncular hallucinosis stems from midbrain lesions and produces vivid, reality-anchored, embellished scenes.
- Patients report elaborate, coordinated experiences that mirror real sensory input (eg hospital tunnel -> spaceship).
Think Occipital Seizures For Recurrent Brief Visual Events
- Consider focal seizures for recurrent, brief, stereotyped visual phenomena occurring multiple times per hour.
- Occipital seizures classically produce simple geometric bright shapes and can spread to cause gaze deviation or postictal deficits.
Large Brain Tumors May Present With Seizure Not Deficit
- Structural brain lesions often present subacutely with seizures rather than large focal deficits.
- Glioblastoma and metastases can be large yet cause minimal exam findings while provoking new focal seizures.
