Vesicoureteral Reflux - International Classification of Vesicoureteral Reflux

International Classification of Vesicoureteral Reflux

• Grade I – reflux into non-dilated ureter
• Grade II – reflux into the renal pelvis and calyces without dilatation
• Grade III – mild/moderate dilatation of the ureter, renal pelvis and calyces with minimal blunting of the fornices
• Grade IV – dilation of the renal pelvis and calyces with moderate ureteral tortuosity
• Grade V – gross dilatation of the ureter, pelvis and calyces; ureteral tortuosity; loss of papillary impressions

The younger the age of the patient and the lower the grade at presentation the higher the chance of spontaneous resolution. Most (approx. 85%) of grade I & II cases of VUR will resolve spontaneously. Approximately 50% of grade III cases and a lower percentage of higher grades will also resolve spontaneously.