Is an MRI scan indicated in a child with new-onset daily headache?

CLINICAL HISTORY This 8-year-old girl presents with a 1-year history of headaches which were occurring once a week until 1 month ago when they increased to almost daily. She has mild headaches about every other day often in the afternoon described as a bifrontal pressure with light sensitivity lasting a couple of hours after taking acetaminophen. On other days, she reports a generalized throbbing associated with dizziness and light sensitivity lasting about 2 hours after she takes acetaminophen. For the last few weeks, she has been averaging two acetaminophen per day. The patient and her mother deny any new stressors. Her grades in school are satisfactory and have not changed in the last year. Family history is negative for migraine. Neurologic examination is normal. The mother is concerned about possible secondary causes of headache and would like a scan of the brain performed even after I advised her that the episodes have features of migraine and tension-type headaches and that there may be an element of medication rebound. Questions.— What is the likelihood that an MRI scan of the brain would be abnormal? What do you advise parents in this situation?