Hydronephrosis with ureteropelvic junction obstruction

**Definition:** A condition caused by any obstruction in or stenosis of the ureteropelvic junction. This condition is characterised by distension of the pelvis and calyces of the kidney with a partial or complete obstructed flow of urine. This condition may present with flank pain, haematuria, pyuria, or hyperpyrexia.

**Exclusions:** - Congenital hydronephrosis - Congenital ureteropelvic junction occlusion (QJCB)