FIGURE 4.  Time course of ¹⁸F-FDG PET in a responder patient (patient 31). (A) Intense ¹⁸F-FDG uptake is evident on baseline scan in a T2 lesion. (B) Significant decrease of SUV is observed on the intermediate scan. Early SUV change was –62%. (C) Complete tumor disappearance is noted on presurgical scan. Subtotal tumor regression (TRG2) was achieved. Activity in left ureter can be seen on transaxial images. n.m. = not measurable.