The following information was extracted from CT or MRI: location of cerebral hemorrhage (lobe, deep brain, brainstem and cerebellum), presence of subarachnoid hemorrhage or intraventricular hemorrhage (IVH), presence of herniation syndrome or hydrocephalus, supratentorial or infratentorial (cerebellum and brain stem), and hematoma volume. In addition, cerebrovascular malformations were assessed using MRA, CTA, or DSA. Hematoma volume was calculated using the equation ABC/2, where A = the greatest hemorrhage diameter by CT, B = the diameter at 90 degrees to A, and C = the approximate number of CT slices with hemorrhage multiplied by the slice thickness (11).

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