In the initial evaluation of a sport-related concussion, when is CT imaging indicated?

In the initial evaluation of a sport-related concussion, when is CT imaging indicated?

• A. In all cases of concussion, CT is indicated
• B. Only if focal neurologic findings, loss of consciousness >60 seconds, or skull fracture
• C. Only after 24 hours
• D. Never

Answer: (B)

In the initial assessment of a sport-related concussion, imaging with CT is reserved for red flags that raise concern for a more serious brain injury. CT is not done routinely because most concussions are mild and imaging won’t change immediate management, and because CT involves radiation and costs. The best time to image is when there are signs suggesting intracranial injury: focal neurologic abnormalities (such as weakness or speech problems), loss of consciousness that lasts for a meaningful duration (often considered longer than a brief moment, such as >60 seconds), or signs of skull fracture (for example, focal head deformity, scoring a high-energy impact, or persistent severe headache with suspicion of fracture). In these scenarios, CT helps detect acute intracranial hemorrhage or fracture and guides urgent decisions. If none of these red flags are present, imaging is typically not indicated during the initial evaluation.

In the initial assessment of a sport-related concussion, imaging with CT is reserved for red flags that raise concern for a more serious brain injury. CT is not done routinely because most concussions are mild and imaging won’t change immediate management, and because CT involves radiation and costs. The best time to image is when there are signs suggesting intracranial injury: focal neurologic abnormalities (such as weakness or speech problems), loss of consciousness that lasts for a meaningful duration (often considered longer than a brief moment, such as >60 seconds), or signs of skull fracture (for example, focal head deformity, scoring a high-energy impact, or persistent severe headache with suspicion of fracture). In these scenarios, CT helps detect acute intracranial hemorrhage or fracture and guides urgent decisions. If none of these red flags are present, imaging is typically not indicated during the initial evaluation.