Mnemonic: Upset Kidneys Drink Their Pee
Grade 1: reflux up to Ureter (w/o dilation)
Grade 2: reflux up to Kidneys (w/o dilation)
Grade 3: Dilation (ureter/pelvis/calyces)
Grade 4: Tortuosity (and worse dilation)
Grade 5: Papillary impression loss
Source: Tweet from Ben Abelson
