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"In this case, the artery that dissected was a vertebral artery, which is more likely to be prone to dissection because of anatomy and the action of the neck manipulation. The personal injury was present within 9 days of treatment. Other than tension headaches, there is no reliable evidence to identify any underlying disease that would be implicated in the dissection of the artery. On balance, the personal injury is determined to have been caused by the neck manipulation performed on 09/11/2007."