Fig. 4

27-year-old male patient complaining of swelling and worsening pain in the left thigh for a week. Axial turbo spin echo (TSE) nonenhanced T1-w. image a shows a cystic round lesion (arrow) within the vastus medialis muscle of the left thigh. TSE T2-w. scan (b) at the same level well depicts the edema of the muscle around the lesion. A clear, subtle rim (hyperintense in a and strongly hypointense in b) encircling the cystic component can be noted, representing the lesion wall. The mass shows typical central restricted diffusion on the apparent diffusion coefficient map (c) and on the diffusion-weighted imaging (d) sequence. The findings were consistent with muscular abscess (arrows)