Abstract
We sincerely thank our colleague F. Haghdoost for highlighting the importance of our findings recently published in this Journal [1] and those of Grangeon et al. [2], which suggest that brain MRI is not useful in cluster headache (CH) patients meeting ICHD-3 criteria. In his letter, he mentions that there could be patients who might have been diagnosed as CH but that after their neuroimaging detecting some abnormal findings might have received another diagnosis and not labelled as CH in our documents.
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