1. Headache previously diagnosed as 6. Headache attributed to cranial and/or cervical vascular disorder or one of its types, subtypes or subforms, and fulfilling criterion C
  2. The cranial or cervical vascular disorder causing the headache has been effectively treated or has spontaneously remitted
  3. Headache has persisted for >3 months after effective treatment or spontaneous remission of the vascular disorder
  4. Not better accounted for by another ICHD-3 diagnosis.

A6.10 Persistent headache attributed to past cranial and/or cervical vascular disorder is poorly documented; if it exists, research is needed to establish better criteria for causation.