Fig. 6

A 14-year-old boy with a 3-week history of pain and swelling of the left clavicle. Anteroposterior radiograph reveals hyperostosis, sclerosis and periosteal reaction of the medial third of the clavicle (a). CT scan illustrates better clavicle periosteal reaction and erosions (b and c). Axial T1WI (d), coronal FST2WI (e) and coronal ceFST1WI (f) images show the same findings, in addition to bone marrow edema and heterogeneous enhancement within the clavicle and surrounding soft tissues. Biopsy revealed sterile inflammation. CNO is the most common disease involving the medial third of the clavicle in all age groups