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In Rare Disorder, Woman's Immune System Attacks Her Own Brain

​A young woman's weeklong bout of "strange behavior" was caused by a rare disease in which the immune systemattacks the brain, according to a new report of the woman's case.
The 27-year-old woman went to the emergency room in Colorado after a week of feeling ill. She had began experiencing short-term memory loss and anxiety, and later developed agitation, hallucinations and involuntary movements, the doctors who treated her wrote in their report.
Prior to that week, the woman had been healthy. She told the doctors that she hadn't drank alcohol, smoked tobacco or used any drugs, according to the report, published Nov. 30 in The New England Journal of Medicine.