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Pattern of nonaneurysmal perimesencephalic hemorrhage. Nonaneurysmal perimesencephalic hemorrhage in a 54-year-old man with a headache after sneezing. The CT demonstrates blood isolated to the perimesencephalic cistern with some extension into the right ambient cistern. No blood is seen in the bilateral Sylvian fissures, and there was no intraventricular hemorrhage.
