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Fig. 4B. —Retained wooden foreign body with abscess and draining sinus tract in 49-year-old man who fell off roof into foliage several months earlier. Sagittal short tau inversion recovery MR image (2,300/30; inversion time, 150 msec) shows foreign body as signal void with surrounding hyperintense granulomatous response. Note associated cellulitis and sinus tract extending through subcutaneous adipose tissue.