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A. Grade 1: renal pelvis is mildly dilated without calyceal dilation. B. Grade 2: renal pelvis is further dilated and some calyces may be visualized. C. Grade 3: renal pelvis and minor calyces are diffusely dilated, but renal parenchyma is of normal thickness. D. Grade 4: as for Grade 3, but with thinning of the renal parenchyma over the dilated calyces.
