Introduction & Objectives Our video shows a case of a female 15 years old patient affected by Pyeloureteral junction stenosis, treated by dismembered pyeloplasty performed by transperitoneal laparoscopic technique using minilaparoscopic 3mm Storz(R) instruments which came under our observation for symptomatic giant hydronephrosis as documented by uro-CT scan. Material & Methods The technique had been performed by placing an optical balloon trocar through the umbilicus, and two working 3mm trocars placed in the left pararectal line. The initial phase of the intervention was represented by the mobilization of the descending colon accessing the retroperitoneal space by using a laparoscopic hook defining the anatomical layers and the dissection of the voluminous renal pelvis and ureter from the surrounding tissues. Once an optimal dissection of the ureteropelvic junction had been achieved, we made a cold-knife incision on it, which had been also spatulated using a Ranfac needle in order to hang it and to remove its redundant part. We then made anastomosis between pelvis and ureter using four semi-continuous sutures. The rear wall suture was first applied, then we sutured the front wall. After that, we completed the pieloplasty after double-J stenting along a guide wire previously inserted by retrograde way. Results We did not have neither intraoperative bleeding nor urinary leakage so the surgery ended without any drain placement. Conclusions The use of the 3mm instruments made the procedure, especially for sutures, particularly easy since the ergonomic instruments allows to comfortably manage the 17 mm needle. The most important advantage is in aesthetic outcomes since we had not need to use stitches on the skin but adhesive strips. The umbilical optical port (10 mm) is useful to remove resected tissues.