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Fig. 1 —Representative examples of after-radiochemotherapy ¹⁸F-FDG PET scans (transaxial sections at perineal level) obtained in patients with rectal cancer after completion of neoadjuvant therapy. A-E Tracer uptake by tumor was scored as intense (SUV_max = 15.4) in 67-year-old man (A), moderate (SUV_max = 5.6) in 52-year-old man (B), mild (SUV_max = 2.3) in 55-year-old woman (C), faint (SUV_max = 1.2) in 50-year-old woman (D), and absent (SUV_max = 0.7) in 48-year-old man (E). Accumulation of radioactivity in bladder provides useful anatomic landmark for topographic reference. SUV_max = maximum standardized uptake value. Arrows are computer-generated and have no particular meaning.