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Fig. 2A. —46-year-old woman with suspected polymyositis. Whole-body turbo short tau inversion recovery (STIR) MR image (TR/TE, 4000/30; inversion time, 160 msec) shows gross symmetric inflammation or muscle edema in proximal upper (curved arrows) and lower limb girdle muscles. Note florid inflammation or muscle edema (straight arrow) in psoas muscles bilaterally. Edema is worse on right.