| Grade | Finding |
| I | ureter and upper collecting system without dilatation |
| II | mild dilatation of ureter and renal pelvis with minimal blunting of fornices |
| III | moderate dilatation of ureter and renal pelvis with minimal blunting of fornices |
| IV | moderate dilatation and tortuosity of ureter with moderate dilatation of renal pelvis and calyces, obliteration of sharp angle of fornices, but maintenance of papillary impression in majority of calyces |
| V | gross dilatation and tortuosity of ureters, renal pelvis and calyces; loss of papillary impression in majority of calyces |
