A 43-year-old male involved in a motor vehicle collision has a forehead contusion, headache, and nausea. He was unconscious for about one minute after the impact and now asks what happened. What is the most likely diagnosis?

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Concussions are mild traumatic brain injuries that cause temporary disruption of brain function after head trauma. A brief loss of consciousness (about a minute) followed by a rapid return to normal or near-normal function, with only a headache or nausea, is classic for a concussion. There are no focal neurological deficits or progressive symptoms described, which supports a mild injury rather than a more serious bleed or fracture. In contrast, a skull fracture would usually present with localized skull tenderness or deformity; an epidural hematoma often features a lucid interval with rapid deterioration from an arterial bleed; a subdural hematoma tends to develop symptoms over hours to days and can worsen gradually. Thus this presentation best fits a concussion.