Figure 5

Fourth grade UUTD (bilateral sides): the coronal and transverse MRU show that the bilateral renal pelvises are severely dilated, there are fluid-filled calices throughout the kidneys, and the renal parenchyma is significantly thinned (renal parenchyma loss > 50%). The maximum intensity projection MRU shows the severely dilated renal pelvis and ureters; the ureter is significantly tortuous and > 15 mm.