Table 1: Vesicoureteral reflux grades according to the international reflux study committee.

GRADES

ANATOMICAL LEVEL AND AFFECTED STRUCTURES

I

Reflux is limited to the ureter (no ureter dilation)

II

Reflux fills the ureter, renal pelvis and collecting system (no dilation)

III

Reflux fills the ureter, renal pelvis and collecting system (Mild ureteral and pelvicalyceal dilation)

IV

Reflux fills the ureter, renal pelvis and collecting system (Gross ureteral dilation with mild tortuosity and calyceal blunting)

V

Reflux fills the ureter, renal pelvis and collecting system (Severe ureteral dilation and tortuosity, severe calyceal blunting, loss of papillary impressions and fornices, intrarenal reflux)