Figure 4

Third grade UUTD (left side): the coronal and transverse MRU show that the renal pelvis is further dilated and there are fluid-filled calices throughout the kidney; the renal parenchyma over the calices is beginning to thin, but renal parenchyma loss is < 50%. The maximum intensity projection MRU shows the dilated renal pelvis and ureters, the ureter is tortuous, and < 15 mm.