Which of the following statements regarding the pathophysiology, clinical presentation, and management of concussions are correct? Select all that apply.

Rationale: A. Concussion presents with a range of neurologic symptoms including headache, dizziness, confusion, drowsiness, nausea, vomiting, and visual disturbances. These are key indicators for clinical assessment. B. Concussions are typically diagnosed clinically through history and neurologic examination. CT scans are often normal and are used primarily to rule out more serious brain injuries, such as intracranial hemorrhage or skull fractures, rather than to confirm a concussion. C. Concussions usually result from a blunt impact or rapid acceleration-deceleration of the head, causing transient brain dysfunction. Common mechanisms include falls, sports injuries, motor vehicle collisions, and assaults. D. Concussions are generally classified based on severity: mild (brief confusion, no loss of consciousness) or classic (loss of consciousness lasting less than 6 hours and post-traumatic amnesia less than 24 hours). E. Most concussions are mild to moderate and resolve with rest and monitoring. Severe traumatic brain injury is a distinct condition involving structural brain damage, prolonged loss of consciousness, or significant neurologic deficits. F. Patients with concussion should be monitored for any worsening symptoms, such as repeated vomiting, severe headache, increasing confusion, slurred speech, or neurologic deficits, which may indicate a more serious injury requiring immediate medical attention.