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Classification of antenatal hydronephrosis based on the anteroposterior diameter of the renal pelvis
| Degree of antenatal hydronephrosis | Second trimester (mm) | Third trimester (mm) |
|---|---|---|
| Mild | 4 to <7 | 7 to <9 |
| Moderate | 7 to 10 | 9 to 15 |
| Severe | >10 | >15 |
Reproduced from Nguyen HT, et al. J Pediatr Urol 2010;6:212-231, with permission of Elsevier [4].
