Reflux Classification
| Grade* | Description |
|---|---|
| I | Reflux into ureter, no dilatation |
| II | Level of kidney, no dilatation |
| III | Mild to moderate dilatation, minimal caliceal blunting |
| IV | Moderate dilatation, loss of angles and fornices, papillary impression in calices still visible |
| V | Gross dilatation and tortuosity, impressions of papillae no longer present |
↵* Proposed by the International Reflux Study Committee (46).