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A healthy 23-year-old man suffered helmet-to-helmet collisions with an opponent during American football game twice within 3 days. He then experienced continuous vomiting and dizziness. Magnetic resonance imaging revealed acute infarction in the right cerebellar hemisphere, and magnetic resonance angiography revealed transient stenosis of the right superior cerebellar artery. Although minor head injury is not usually accompanied by complications, posttraumatic ischemic stroke has been reporteddoi:10.2176/nmc.cr.2014-0094 pmid:25746313 pmcid:PMC4533407 fatcat:zragaumgdne47cbimjz7jucdpy