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The objective of this video is to illustrate feasibility of the ureteral ligation for the treatment of massive ureteroceles associated with non-functioning upper kidney moieties in duplex kidneys. In this video, one case is presented to demonstrate this novel technique. A nine-year-old boy presented with progressive lower urinary tract symptoms. Radiological workup depicted a duplex kidney on the left side with the absence of function on the upper pole and hydroureteronephrosis with a massive ureterocele. Laparoscopic ureteral transection, drainage, and ligation of both extremities of the enlarged ureter (upper pole ureter) were performed. Immediately after ureteral ligation, ultrasonic evidence of ureterocele decompression and improved hydroureteronephrosis was observed. This patient remained asymptomatic without postoperative complications after 3 years. De novo reflux was not observed. Ureteral ligation, as demonstrated in the video, is a good approach for the treatment of massive ureteroceles associated with non-functioning upper kidney moieties in duplex kidneys. Compared with the current standard techniques (incision/puncture), ureteral ligation has the clear advantage of not causing 'de novo reflux' or unsuccessful de-obstruction, and is not as surgically demanding as other reconstructive/ablative techniques. The disadvantage is the need of regular clinical and ultrasonographic follow-up. [ABSTRACT FROM AUTHOR]