Correspondence to 'Slope sign: a feature of large vessel vasculitis?

We have read with great interest the observation of Dasgupta et al.1 We would like to propose an extended definition of slope sign in giant cell arteritis (GCA) formerly named slide sign,23 and present our method of assessing it by using the anteromedial ultrasound examination method of the large supraaortic vessels.4

Slope sign is a pathologically increased intima-media thickness (IMT)5 that spreads over a long arterial segment and slides down to a normal brachial artery where a normal intima-media structure (double line) is observed. This definition contains a description of pathological findings in the axillary artery—a typical location for vasculitis in GCA, contrasting with normal findings in brachial artery—which is usually not involved by vasculitis.6 Slope sign may not be limited to the place of arterial bifurcation of the subscapular artery, which is a typical location...