Lhermitte Peduncular Hallucinosis
Video shows a 66-year-old man with the sudden onset of vivid visual hallucinations during wakefulness following bariatric surgery. Apart from describing the hallucinations, he was alert, attentive, and fully oriented without any confusion. He described seeing in his hospital room, for example, synchronized swimmers, snakes crawling up to the bed, numbers melting off the clock, and plumes of smoke at the nursing station. Diffusion-weighted imaging (DWI) and apparent diffusion coefficient MRI demonstrated a mesencephalic stroke, consistent with a diagnosis of peduncular hallucinosis.