When you might need a CT scan: An imaging test might be appropriate if you have an abnormal neurological exam or your doctor can't diagnose your headache based on your symptoms and an exam.

A decreased sense of smell predicted an abnormal CT scan, but headache, facial pain and difficulty sleeping were all more common in the patients with a normal scan. Further, the worse the reported ...

none of the 58 abnormal scans in this study showed evidence of either intra- or extra-axial blood or unilateral findings. Outcome was also poor in those patients who had a normal initial CT and an ...