A. Headache previously diagnosed as 7. Headache attributed to non-vascular intracranial disorder or one of its subtypes or subforms, and fulfilling criterion C
B. The non-vascular intracranial 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 A7.9 Persistent headache attributed to past non-vascular intracranial disorder, if they exist, have been poorly documented; research is needed to establish better criteria for causation.