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Fig. 4B. 81-year-old woman with abscess in iliopsoas muscle who
presented with left hip pain, no history of trauma, and clinical suspicion of
occult fracture. T2-weighted image shows central area of high signal
surrounded by concentric focus of low- and high-signal zones, consistent with
abscess (solid arrow). Abnormally high signal in iliacus muscle
(open arrows) is result of muscle inflammation.