Objective. To describe a simplified technique already used in our institution for several years in the open heminephrectomy for duplication anomalies, now performed through a retroperitoneal laparoscopic approach. Methods. The technique begins with upper pole parenchyma incision since the demarcation between the affected upper moiety and the healthy lower pole is easily established. The dissection proceeds until the urothelium of the collecting system is entered, which will guide further excision, minimizing damage of the surrounding structures. The vascular supply is then identified since the upper pole is attached to the remaining renal parenchyma only by these structures that can be safely divided. Dissection and division of the ectopic ureter is carried next. Results. The operative time was 188 minutes. The blood loss was not significant, and there were no other complications during the procedure. The patient was discharged home 48 hours after the procedure, without any early or late postoperative complications. Conclusion. We believe this simplified technique allows a safer excision of nonfunctioning upper pole renal tissue by avoiding the initial dissection of the renal hilum, which associated with the known advantages of a laparoscopic approach makes us consider it the procedure of choice for upper pole nephrectomy in children.