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Patient inclusion flowchart. ED, emergency department; NCCT, non‐contrast CT; CTA, CT angiography; CVT, cerebral venous thrombosis; AVM, arteriovenous malformation; LP, Lumbar puncture; RCVS, reversible cerebral vasoconstriction syndrome; CAD, cervical arterial dissection; IH, intraparenchymal hemorrhage; SOL space occupying lesion
