In 2022, we treat 2 children with hydronephrosis and pyonephrosis, 1 primary ureteropelvic junction obstruction recurrent after laparoscopic pyeloplasty.All have purulent pyelonephritis urinary abdomen. After comprehensive anti-infection+abdominal drainage +renal pelvis drainage, the infection was significantly improved, they were cured discharged pyeloplasty under general anesthesia. Conclusio...