A 71-year-old man presented to the emergency department with a 3-day history of changes in mental status. His partner noted that the patient had become more irritable than usual and was behaving as if other people were in the room with him when no one else was present. The patient had also had several episodes of uncontrollable laughter for no apparent reason.
On presentation, the patient appeared to be intermittently confused about where he was and at times displayed increased talkativeness and incoherent speech. He also appeared to be unstable while standing or walking, and his partner reported that the patient had had several falls, without injury to his head.
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Read more at the New England Journal of Medicine