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Fig. 1. —26-year-old woman with diabetes mellitus and acute onset of pain in left thigh.

C, Axial T2-weighted MR image with fat saturation shows diffusely increased signal intensity involving discrete muscle groups: vastus medialis, vastus lateralis, vastus intermedius, and adductor magnus muscles (arrows). Note increased linear signal intensity in subcutaneous fat and fascia (arrowheads), indicating subcutaneous edema and subfascial fluid.