Autopsy: A highly specialized surgical procedure for the thorough examination of a corpse by dissection to determine the cause of death and to evaluate any disease or injury that might be present.

Concussion: A severe blow to the head that causes blurred or double vision, seeing stars, sensitivity to light or noise, headache, dizziness or balance problems, nausea, vomiting, trouble sleeping, fatigue, confusion, difficulty remembering, difficulty concentrating, or loss of consciousness.

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