Assertion: brain aneurysm | /r/HasSubevent | abnormal widening
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Source sentences:
text: A brain aneurysm (also called a cerebral aneurysm or an intracranial aneurysm) is a bulging, weakened area in the wall of a blood vessel in the brain, resulting in an abnormal widening or ballooning greater than 50 percent of the normal diameter (width).