Lead Sponsor

Yonsei University

Age

0 - 3 years

Sex

ALL

Healthy Volunteers

Yes

•\<Group 1\>
•1. 0-3 year old patients with SFU grade 2 or more hydronephrosis without ureteral dilatation
•2. needs pyeloplasty due to differential renal function (DRF)\<40%, decreased DRF by more than 5%, development of urinary tract infection, development of urinary stone, and development of pain related with UPJO \<Group 2\>
•1\. 0-3 year old patients with SFU grade 3 or 4 hydronephrosis without ureteral dilatation 2. doesn't meet the above criteria for the indication of pyeloplasty \<Group 3\>
•1\. 0-3 year old children without any abnormality of urinary tract

•\<Group 1\>
•1. patients with contralateral disease affecting DRF
•2. history of previous urinary tract surgery
•3. follow up loss before diuretic renogram performed at 6-12 months from operation \<Group 2, 3\>
•1\. patients with contralateral disease affecting DRF 2. history of previous urinary tract surgery

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