Ureteropelvic junction obstruction occurs when the junction (called the renal pelvis) that attaches the kidney to the ureter becomes blocked. This blockage either slows down or stops the normal ...

Total renal length (RL) and renal pelvic anteroposterior diameter (APD) were measured. Hydronephrosis was scored by the ratio of APD to RL. Individual kidneys were classified as no hydronephrosis ...