Fig. 2

Distribution of bone marrow edema and edema of the surrounding soft tissue in the ACW region in patients with SAPHO syndrome. a The first rib lesion without involvement of the first SCoJ or the medial end of the clavicle. b The first SCoJ lesion. c Lesions in the costoclavicular ligament area with involvement of the medial end of the clavicle. d Lesions in the medial end of the clavicle adjacent to the manubrium without involvement of the adjacent sternoclavicular joint. e The SClJ lesion. f The sternal angle lesion. g Lesions in the second to sixth SCoJ. h The four common patterns of involvement: (I) the first rib area, possibly developing from the anterior end of the first rib (type A) to the first SCoJ (type B) and the costoclavicular ligament (type C); (II) the sternoclavicular area, involving the SClJ (type E), the medial end of the clavicle (type D), and the interclavicular ligament; (III) the sternal angle area (type F); and (IV) the areas of the second to sixth SCoJs (type G). BME, bone marrow edema; SCoJ, sternocostal joint; SClJ, sternoclavicular joint