Fig. 2
US and CT manifestations. Images A–F and G–L are from recipients 2 and 3, respectively. A and G: Color Doppler flow images revealed solid hypo-echo neoplasm with punctiform blood flow signals in the transplanted kidneys. B and H: Non-enhancing CT revealed slightly higher densities of neoplasms than allografts. C, D, I, J: Enhanced multiphase images revealed slow and relatively homogeneous enhancement inside the neoplasms, with lower densities than the allografts. E and K: CT revealed pulmonary metastases. F and L: CT revealed elimination of metastases after targeted therapy