Fig. 5
Cross-sectional areas of the quadriceps muscle in the tumour’s maximally bulging region. a Before surgery it measured 2434.4 mm2 (rectus femoris, vastus medialis, vastus intermedius, and vastus lateralis). b Six months after surgery it was 921.7 mm2 (portion of the vastus lateralis is visible). This 6-month postoperative cross-sectional area of the quadriceps muscle (at the level of longest diameter of the tumour) had decreased to 37.9% of that before surgery