巨细胞动脉炎(giantcellarteritis,GCA)是一种原因不明的系统性血管炎,主要累及主动脉弓起始部的动脉分支(如椎动脉、颈内动脉、颈外动脉、锁骨下动脉),亦可累及主动脉的远端动脉及中小动脉(如颞动脉、颅内动脉、眼动脉等),故属大动脉炎范畴。由于早年发现的病例几乎均为颞动脉 Giant cell arteritis (GCA) is an undiagnosed systemic vasculitis that involves mainly the arterial branches (eg, vertebral artery, internal carotid artery, external carotid artery, subclavian artery) at the origin of the aortic arch and may also involve Aortic distal artery and small artery (such as temporal artery, intracranial artery, ophthalmic artery, etc.), it is a category of arteritis. Due to the early detection of almost all cases of temporal arteries