VA	vertebral artery/ arteries
GCA	giant cell arteritis
ACR	American College of Rheumatology
CDUS	colour Doppler ultrasound
MRI	magnetic resonance imaging
MR-A	magnetic resonance angiography
CT	computed tomography
FDG-PET	18F-fluorodeoxyglucose positron emission tomography
ICD	International Statistical Classification of Diseases and Related Health Problems
TIA	transient ischemic attack
IV	intravenous
GCs	glucocorticosteroids
MTX	methotrexate
TCZ	tocilizumab
ESR	erythrocyte sedimentation rate
CRP	c-reactive protein
EVT	endovascular therapy