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a Initial DWI showed modest diffusion abnormality in the deep portion of the right MCA territory. b TTP PWI showed large perfusion lesion throughout the right MCA territory, with extensive mismatch. c MRA demonstrated abrupt occlusion of the right M1 segment. After the patient tolerated the Heads Up test, supportive care was pursued. d Follow-up diffusion MRI 3 h later showed no new diffusion lesions and partial regression of the initial lesion.
