FIGURE 2.

Internal view of the direction of the assistant port using (A) the original port and (D) the reverse port. (B) Exposure of Calot's triangle using the original port; red arrow indicates the direction of gallbladder traction by the assistant port. The angle between CBD (solid line) and cystic duct (dotted line) is narrow. (E) Exposure of Calot's triangle using the reverse port. The direction of gallbladder traction is toward the right lateral direction (red arrow); the angle between CBD and cystic duct is more widened. The position of the assistant during operation: (C) SSRC using the original port, assistant positioned at the right side of the patient. (F) SSRC using the reverse port, assistant positioned at the left side of the patient.