RETROPERITONEAL FIBROSIS.
D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D006869:Hydronephrosis; D012185:Retroperitoneal Fibrosis; D012187:Retroperitoneal Space; D013514:Surgical Procedures, Operative; D014517:Ureteral Obstruction
ADOLESCENCE; DIAGNOSIS, DIFFERENTIAL; HYDRONEPHROSIS; RETROPERITONEAL FIBROSIS; RETROPERITONEAL SPACE; SURGERY, OPERATIVE; URETERAL OBSTRUCTION