Grade

Characteristics

I

Reflux into non-dilated ureter

II

Reflux into the renal pelvis and calyces without dilatation

III

Mild/moderate dilatation of the ureter, renal pelvis and calyces with minimal blunting of the fornices.

IV

Dilation of the renal pelvis and calyces with moderate ureteral tortuosity.

V

Gross dilatation of the ureter, pelvis and calyces; ureteral tortuosity; loss of papillary impressions