Pediatric congenital pelvic ureteral junction obstruction

Congenital ureteropelvic junction obstruction (UPJO) is one of the most common pediatric urinary deformities that can cause hydronephrosis. Obstruction of the pelvic ureteral junction includes three types: endogenous obstruction, exogenous obstruction, and secondary obstruction. Due to the obstruction of the connection part, the urine in the renal pelvis cannot flow smoothly and timely into the ureter, resulting in the continuous and progressive expansion of the renal collecting system, which further destroys the emptying capacity of the renal pelvis.

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