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False negative subject. A 20-year-old with GCS 14 and unclear episode of loss of consciousness. The patient would be classed as low-risk mild traumatic brain injury and had a S100B of 0.09 μg/L. CT shows a small contusion and extracranial soft tissue swelling. The contusion subsided on follow-up CT after 25 days. The patient did not need any intervention or treatment and was discharged from the inpatient unit with a good neurological outcome
