A child presented with Intermittent episodes of left sided flank pain. Ultrasonography reveals large hydronephrosis with dilated renal pelvis and coical thinning with a normal ureter. Kidney differential function was observed to be 19% which of the following is the best management

Pyeloplasty is performed to treat an uretero-pelvic junction obstruction if residual renal function is adequate There are different types of pyeloplasty depending on the surgical technique and patterns of incision used. These include the Y-V, Inveed &;U&;, and Dismembered types of pyeloplasty. The dismembered type of pyeloplasty (called an Anderson-Hynes pyeloplasty) is the most common type of pyeloplasty. This was described in relation to retrocaval ureter (now renamed as preureteric vena cava). Another technique of pyeloplasty is Culp&;s pyeloplasty, in this method a flap is rotated from dilated pelvis to decrease narrowing of ureter. A pyeloplasty can either be done by the robotic, open, or laparoscopic route. Reference: GHAI Essential pediatrics, 8th edition