- Headache previously diagnosed as 7. Headache attributed to non-vascular intracranial disorder or one of its types, subtypes or subforms, and fulfilling criterion C
- The non-vascular intracranial disorder causing the headache has been effectively treated or has spontaneously remitted
- Headache has persisted for >3 months after effective treatment or spontaneous remission of the non-vascular disorder
- Not better accounted for by another ICHD-3 diagnosis.
It is known from clinical experience that persistent headache can occur after a past (and resolved) non-vascular intracranial disorder; to some extent such headache has been demonstrated after 7.1.1 Headache attributed to idiopathic intracranial hypertension and 7.2.3 Headache attributed to spontaneous intracranial hypotension. However, A7.9 Persistent headache attributed to past non-vascular intracranial disorder is poorly documented. Research is needed to establish better criteria for causation.