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Fig. 4A. —56-year-old man with suspected polymyositis. Whole-body turbo short tau inversion recovery MR image (TR/TE, 4000/30; inversion time, 160 msec) of posterior aspect of upper torso shows extensive inflammation in deltoid, trapezius, triceps, and latissimus dorsi muscles bilaterally (straight arrows) and further muscle edema and inflammation in vastus medialis and lateralis muscles of left thigh (curved arrow). Note susceptibility artifact at site of right hip prosthesis, limiting assessment of muscles adjacent to this site.