Fig. 1. Intraoperative view. Pure single port placed through a 2.5-cm umbilical incision, for accommodating 4 instruments including camera with extra orifice for assist port. Note no additional port for assist surgeon's intervention. (A) Endo-pouch and 2 gauzes were put into the abdominal cavity before robot docking (white arrow). (B) External view of the docked da Vinci SP. Three arms and one endoscope entering the single-port parallel to each other. Surgical specimen with small gallbladder stones (C), and 2.5-cm skin incision at the umbilicus (D).