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FIGURE 2. Pattern 2: incongruent findings of abnormal 18F-FDG uptake representing residual cancer inside larger residual mass seen on CT after treatment. A 34-y-old male patient with leiomyosarcoma of left chest wall. There was decrease in size of tumor on repeated CT studies after chemo- and radiotherapy, suggesting response to treatment. However, CT (left), 18F-FDG (center), and hybrid TET (right) images indicate presence of viable cancer inside residual tumor mass. Patient died with tumor progression 6 wk later.
