Figure 2. Escherichia coli muscle abscess and bacterial myositis. (a) Axial STIR and (b) coronal T₁ weighted sections through the thighs in an iv drug injector. A focal abscess is shown in the right adductor magnus muscle, with marked swelling and oedema of the adductors. Gas is seen within the muscle (arrows) and cellulitis is shown in the adjacent subcutaneous fat. E. coli was isolated from the abscess.