39-year-old man with chronic osteomyelitis of the tibia and a draining wound. Plain films (A and B) demonstrate a sclerotic sequestrum in the defect of the tibia (arrow). Magnetic resonance imaging axial T1 & T2 images (C and D) show the sequestrum (arrow) in the intraosseous abscess. The abscess/sinus tract can be seen extending to the skin on the T2 image (arrowhead).
