Figure 1.

Edema of the limb on MRI (A and B) and on clinical examination (C). A and B: Axial plane, three levels of acquisition, T1 sequence (A) and T2‐STIR sequence (B). On the three levels of acquisition (above at the level of the shoulders, a little lower at the level of the thorax and the middle part of the arms and even lower at the level of the proximal root of the two thighs) there is an edematous infiltration with an almost normal T1 (A) signal but a T2‐STIR hypersignal of the peripheral subcutaneous tissue around muscle and bone. Almost all the muscles are in T2‐STIR hyperintensity (B), reflecting an edema due to myositis. Hyperintensity of the fascia can also be observed, but this image was not observed in the other patients. There is no significant fatty involution or amyotrophy evoking an older involvement. C: edema of the limb of a patient with myositis