Takayasu arteritis (TAK) and giant cell arteritis (GCA) are defined as large vessel vasculitis (LVV).[1] Although TAK and GCA are classified as different diseases based on age, clinical symptoms, and vascular imaging,[2,3] they share some similarities, including constitutional symptoms, headache, ischemic manifestations, and elevated erythrocyte sedimentation rate and C-reactive protein levels.[4,5] Although the onset of TAK was thought to be younger than that of GCA, late-onset TAK has been recognized recently.[5,6] These things often make it difficult to distinguish between TAK and GCA. This evidence concerns the gene CRP and temporal arteritis.