“…However, there have been reports 3 Armona et al, 4 Calvo Romero et al 5 and Bongartz et al 6 of patterns of inflammation limited to the small vessels surrounding the adventitia, to the adventitial vasa vasorum or to the entire tunica adventitia with no involvement of the tunica media. 1,12,13 The vasculitic involvement is patchy; a sample of at least 10---20 mm in length is therefore recommended. 1,12,13 The vasculitic involvement is patchy; a sample of at least 10---20 mm in length is therefore recommended.…”