A Vertebral Artery Halo Sign Indicates Giant Cell Arteritis Affecting the Posterior Circulation of the Brain
Lancet 397:e6, Lambrechts, R.A.,et al, 2021
Polymyalgia Rheumatica and Giant Cell Arteritis
Rheum Dis Clin North Amer 26:493-515, Evans,J.M. & Hunder,G.G., 2000