A. Headache previously diagnosed as 6. Headache attributed to cranial or cervical vascular disorder or one of its subtypes or subforms, and fulfilling criterion C
B. The cranial or cervical vascular disorder causing the headache has been effectively treated or has spontaneously remitted
C. Headache has persisted for >3 months after effective treatment or spontaneous remission of the vascular disorder
D. Not better accounted for by another ICHD-3 diagnosis.
Headaches meeting the criteria for A6.10 Persistent headache attributed to past cranial or cervical vascular disorder, if they exist, have been poorly documented; research is needed to establish better criteria for causation.