ACR/EULAR classification criteria for giant cell arteritis
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Entry criteria
Evidence of medium- or large-vessel vasculitis on imaging
Alternative diagnoses mimicking vasculitis are excluded
Age ≥ 50 years at the time of diagnosis
Clinical criteria
Morning stiffness in shoulders/neck
Sudden visual loss
Jaw or tongue claudication
New temporal headache
Scalp tenderness
Abnormal examination of the temporal artery absent or diminished pulse, tenderness, or hard "cord-like" appearance)
Laboratory, imaging, and biopsy criteria
Maximum erythrocyte sedimentation rate ≥ 50 mm/hour or maximum C-reactive protein ≥ 10 mg/L before initiation of treatment
Positive temporal artery biopsy or halo sign on temporal artery ultrasound
Bilateral axillary involvement luminal damage, such as stenosis, occlusion, or aneurysm)
Fluorodeoxyglucose-positron emission tomography activity throughout descending thoracic and abdominal aorta fluorodeoxyglucose uptake in the arterial wall greater than liver uptake by visual inspection)
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