The differential diagnosis for an acute hemiparesis in a child includes stroke, Todd paralysis, and hemiplegic migraine. In the context of an illustrative case, this review highlights the differences in clinical presentation among these entities and an approach to the diagnostic workup. Migraine with aura in children is reviewed, including migraine equivalents such as abdominal migraine and the particular presentation of hemiplegic migraine. An approach to the prophylactic and acute treatment for children with migraine with aura is offered. Neurology ® 2010;75:e16 -e19 CASE: PART 1 A 14-year-old boy with Crohn disease was admitted for a presumed flare. On the second hospital day, his abdominal pain acutely increased. Shortly thereafter, he experienced tingling starting in his shoulder and spreading over his left hemibody over 10 seconds. This was accompanied by 7/10 pounding left-sided head pain. Several minutes later, the tingling gave way to diminished sensation and weakness on the left. These symptoms persisted into the next morning, at which time a neurologic consultation was requested. Now 20 hours into the attack, he had 5/10 pounding head pain. Neurologic examination revealed a left hemiparesis in a pyramidal distribution, with face and arm affected more than leg. Sensation was also diminished over the left face and hemibody. Reflexes were normal and there was no neglect. Complete blood count, electrolytes, erythrocyte sedimentation rate, liver function tests, lactate, amylase, and lipase were normal.