Fig. 9.

a, b, c, d Inflammatory. A 49-year-old woman with swelling and pain in the left sternoclavicular joint and history of psoriasis. MRI highlights the ELMSI of the joint (arrows), which is hyperintense in STIR (a–c) and hypointense in T1w (b–d) imaging. This is a very particular condition and can be referred to either an early SAPHO (synovitis-acne-pustulosis-hyperostosis-osteitis) syndrome, which is often connected with a special form of psoriasis (pustulosis palmoplantaris) and has an inflammatory involvement of the sternoclavicular joint, or a Tietze syndrome, a painful inflammation that can affect the costochondral, costosternal, or sternoclavicular joints