Objective To evaluate the application of stentless dismembered pyeloplasty in ureteropelvic junction obstruction( UPJO) infants. Methods A total of 486 UPJO infants undergoing dismembered pyeloplasty at a single center during 2006 to 2015 were reviewed. Then 47 stentless cases were divided into subgroup A( n = 34,with perirenal drainage) and B( n = 13,without perirenal drainage). And 251 cases with double J stent were assigned into INS group while 188 cases with external urethral stent EXS group. The releva...