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Figure 1: (a and b) Computed tomography: High density was seen in the subarachnoid space, which around the medulla and mesencephalon; (c and d) Digital subtraction angiography: No obvious abnormalities were found. (day 1)

Figure 1: (a and b) Computed tomography: High density was seen in the subarachnoid space, which around the medulla and mesencephalon; (c and d) Digital subtraction angiography: No obvious abnormalities were found. (day 1)