<prompt> Most specific symptom of temporal aeritis?Visual lossJaw claudicationTemporal headachePolymyalgia rheumatica  <response>: Giant cell aeritis temporal aeritis is a chronic vasculitis of large and medium vessel aeries, usually affecting the cranial branches of aeries arising from aoic arch. Jaw claudication is an underrepoed, yet, a very specific symptom of GCA, with a high positive predictive value. Ref : Harrisons Principles of Internal medicine, 21st edition , Page 2188; NEJM, May 5, 2016, 1794-1795. 