Headache caused by and symptomatic of an inflammation of cervical, cranial and/or brain arteries. Headache may be the sole symptom of arteritis.
A. Any new headache fulfilling criterion C
B. Arteritis has been diagnosed
C. Evidence of causation demonstrated by either or both of the following:
1. headache has developed in close temporal relation to other symptoms and/or clinical signs of onset of arteritis, or has led to the diagnosis of arteritis
2. either or both of the following:
a) headache has significantly worsened in parallel with worsening of arteritis
b) headache has significantly improved in parallel with improvement of arteritis
D. Not better accounted for by another ICHD-3 diagnosis.