An 8-year-old boy presented to the pediatric emergency unit after a 1-week history of daily debilitating left parieto-temporo-occipital headache associated with scalp hair allodynia. On admission, he denies visual symptoms, nausea, vomiting, phono-/photophobia or any other focal deficit. He describes pain as constantly shooting but fluctuating in intensity during the day, occasionally causing him to wake up at night. Although symptoms started 1 day after a soccer game, they are neither triggered by anything specific, nor are they relieved by acetaminophen or ibuprofen. Lately, the boy did not attend school because of pain. His parents also report that their son has had unusual tiredness and reduced appetite.

Further questioning reveals only a minor head trauma without loss of consciousness 2 months ago, when he fell from a height of ∼2 m, landing on his hands with a slight impact on the back of his head. The boy has no remarkable...

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