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Persistent tumor following CRT. (a) Pre-treatment axial fused FDG PET-CT demonstrates a hypermetabolic tumor in the mid-esophagus (white arrowhead); (b) Axial fused FDG PET-CT image 12 weeks following completion of CRT demonstrates persistent, although improved, hypermetabolic soft tissue mass in the mid-esophagus (white arrowhead). Biopsy confirmed the presence of persistent viable tumor.
