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. 2007 Jul 6;38(1):40–53. doi: 10.1007/s00247-007-0529-7

Table 1.

Reflux grading in contrast-enhanced VUS

Grade Definition
I Microbubbles only in the ureter
II Microbubbles in the renal pelvis; no significant renal pelvic dilatation
III Microbubbles in the renal pelvis + significant renal pelvic dilatation + moderate calyceal dilatation
IV Microbubbles in the renal pelvis + significant renal pelvic dilatation + significant calyceal dilatation
V Microbubbles in the renal pelvis + significant renal pelvic dilatation and calyceal dilatation + loss of renal pelvis contour + dilated tortuous ureters