Fig. 1

Magnetic resonance and computed tomography images. A Panel a: Diffuse-weighted magnetic resonance imaging sequence acquired on the day of admission. Panel b: Diffuse-weighted magnetic resonance imaging sequence acquired on the day after admission. The rectangular area displays a cerebral infarction lesion located in the left watershed region. B Panel a: Computed tomography image taken on the day of admission. Panel b: Computed tomography image taken on the day the patient suffered a new acute subarachnoid hemorrhage. Panel c: Computed tomography image taken during the final digital subtraction angiography