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A 43-year-old man presented to the emergency department with a 2-day history of headache; he reported being otherwise healthy. Four weeks earlier, he had been an unrestrained driver involved in a motor vehicle accident in which he lost consciousness but did not present to a hospital. He reported having no history of coagulopathy, alcohol abuse, or use of antiplatelet or anticoagulant medication. In the emergency department, his clinical course deteriorated over a period of several hours, with worsening headache, nausea, vomiting, and lethargy. Computed tomography (CT) of the brain, performed without the administration of contrast material, revealed a loss of . . . [Full Text of this Article] |