(a) A wound retractor was placed at the pararectal incision of 6 cm made in the right upper quadrant. (b) Nephroureterectomy was carried out by keeping the retroperitoneal working space made along the anatomical plane using the Omni-Tract retractor system and PLES retractors (an arrow head). Asterisks indicate blades of the Omni-Tract retractor system. (c) Isthmusectomy was conducted using a bipolar sealing device. A vessel loop was passed beneath the isthmus. (d) The right retroperitoneal after completion of right nephroureterectomy and isthmusectomy. A drain tube was placed here after extensive saline irrigation.