Although ureteropelvic junction obstruction and duplex kidney are common anomalies in child age group, the combination of these two anomalies is a rare association and infrequently reported. A 2 month old male patient antenatally diagnosed as having hydronephrosis of right kidney, was brought to us for follow up. Renal scans and ultrasonography suggested ureteropelvic junction obstruction. It was only intra-operatively, at the time of pyeloplasty that we found he had duplex system of the same side, not picked up in any of the earlier investigations. Pyeloplasty was done over a double J stent. Patient was discharged and called for follow up.
 Parks, Han SS, Choi HK. Duplicated ureters: 2 cases treated with ipsilateral ureteroureterostomy (end to side anastomosis). Korean J Urol. 1985;26(4):339-42.
 Freyer S, Deming CL. Congenital hydronephrosis in the lower half of a double kidney; report of a case. N Engl J Med. 1942;226:220-23.
 Snyder HM, Lebowitz RL, Colondy AH, Bauer SB, Retik AB. Ureteropelvic junction obstruction in upper and lower pole moiety of duplex systems. Urologic Clinics of North America. 1980;7(2):273–90.
 Liu W, Zhang L, Ma R, Wu R. The morphology and treatment of coexisting ureteropelvic junction obstruction in lower moiety of duplex kidney. Int J Surg. 2016;34:23-27.
 Gonzalez F, Canning DA, Hyun G, Casale P. Lower pole pelvi-ureteric junction Obstruction in duplicate collecting systems. BUJ Int. 2006;97(1):161-5.
 Fernbach SK, Zawin JK, Lebowitz RL. Complete duplication of the ureter with ureteropelvic junction obstruction of the lower pole of the kidney. AJR Am J Roentgenol. 1995;164(3):701-4.
 Amis ES, Cronan JJ, Pfister RC. Lower moiety hydronephrosis in duplicate kidneys. Urology. 1985;26(1):82-8.
 Wah TM, Weston MJ, Irving HC. Lower moiety pelvicureteric junction obstruction (PUJO) of the duplex kidney presenting with pyonephrosis in adults. Br J Radiol. 2003;76(912): 909-12.
 Fernbach SK, Feinstein KA, Spencer K, Lindstrom CA. Ureteral duplication and its complications. Radiographics. 1997;17(1):109-27.
 Ozturk H, Dagistan E, Ozturk S, Ozturk H. Pelvioureteric junction obstruction of the lower collecting system associated with incomplete ureteral duplication: A case report. Ped Urol Case Rep 2014;1(6):11-15.
 Horst M, Smith GH. Pelviureteric junction obstruction in duplex kidneys. BJU International. 2008;101(12): 1580–4.