Fig. 1. Positron emission tomography/computed tomography (PET/CT) scanning at different time points. (a) PET/CT before the second donor-derived chimeric antigen receptor-T (CAR-T) cell infusion. The red arrows indicate abnormal uptake involving the right retroperitoneal cavities and the left pelvic wall. (b) The PET/CT scans show significantly diminished leukemia lesions one month after the second donor-derived CAR-T cell infusion. (c) The PET/CT scans prove complete remission three months after the second donor-derived CAR-T cell infusion. Scale bar=10 cm.