A rare case of acute subdural hematoma from rupture of a nontraumatic aneurysm of the middle meningeal artery is described. The subdural hematoma was evacuated and the aneurysm was removed. The literature on nontraumatic aneurysm of the middle meningeal artery is reviewed. The importance of cerebral angiography in the patient with an unexplained subdural hematoma is emphasized.
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