Imaging Guidelines for Concussion with Neck Pain

Head CT Indications

The American College of Radiology recommends immediate non-contrast CT of the head if a patient with concussion and neck pain has any of the following high-risk features: loss of consciousness, post-traumatic amnesia, GCS <15, focal neurologic deficit, vomiting, severe headache, anticoagulation/antiplatelet therapy, age ≥60-65 years, or signs of skull base fracture 1, 2, 3
A Glasgow Coma Scale (GCS) score <15 at any point after injury is an indication for immediate CT imaging, with a strength of evidence supported by multiple citations 1, 3, 4
Loss of consciousness of any duration is a high-risk feature that warrants CT imaging 2, 3
Post-traumatic amnesia (>30 minutes before impact is particularly high-risk) is another indication for CT imaging 2, 3
Focal neurologic deficits on examination require CT imaging, as they may indicate underlying structural damage 1, 3, 4
Vomiting (≥2 episodes increases risk significantly) and severe or persistent headache are also indications for CT imaging 1, 2, 3
Physical evidence of trauma above the clavicles, including signs of basilar skull fracture, warrants CT imaging 2, 3
Post-traumatic seizure is a high-risk feature that requires CT imaging 2, 3

The American College of Radiology states that warfarin increases intracranial injury risk 1.88-fold and mandates CT imaging regardless of symptom severity 2
Dual antiplatelet therapy (aspirin + clopidogrel) increases risk 2.88-fold and requires CT imaging 2
Novel oral anticoagulants (NOACs) carry lower but still significant hemorrhage risk and warrant imaging 2
Aspirin monotherapy alone does not significantly increase risk and is not an absolute indication for CT 2
Clopidogrel or other antiplatelet agents require CT imaging 2, 3

Age ≥60-65 years is itself a high-risk criterion that warrants head CT when combined with any other risk factor, with a reported odds ratio of 19.2 for intracranial injury even in patients with GCS 14-15 2, 3
Elderly patients (>60 years) with GCS 15 and amnesia had a 10% positive CT rate, with some requiring neurosurgical intervention 2

CTA of the head and neck should be obtained if there is suspicion of traumatic vascular injury, particularly with neck pain and neurologic symptoms suggesting vertebral artery dissection, with a reported sensitivity of 97.7% and specificity of 100% for vascular injury detection 5, 6, 7, 8
Skull base fractures involving the carotid canal, cervical spine fractures, unexplained neurologic deficits, and penetrating head/neck trauma are indications for CTA imaging 5, 6, 7, 8

The American College of Radiology recommends that CT imaging should not be delayed if high-risk features are present, with optimal detection of lesions occurring when CT is performed ≥5 hours post-trauma 1, 2, 4

Repeat CT imaging is indicated if initial CT shows intracranial hemorrhage in anticoagulated patients, with a reported 3-fold increased risk of hemorrhage progression 2
Neurologic deterioration after initially normal or stable CT, and failure to achieve GCS 15 after 24 hours despite normal initial CT, are indications for repeat CT imaging 1, 4

MRI is not indicated for initial evaluation of acute head trauma, but is more sensitive than CT for detecting posterior fossa lesions, diffuse axonal injury, small contusions, and cerebellar infarcts from vertebral dissection, with a reported higher sensitivity for these specific injuries 1, 4, 5, 7
Consider MRI when initial CT is normal but persistent neurologic findings remain, or in subacute/chronic phase for better characterization of injury 5, 7