A method of examining a hollow body cavity using an endoscope to achieve receiving two images in two opposite directions inside the hollow cavity is provided. The endoscope comprises a shaft extending along a longitudinal axis, having distal and proximal ends, and defining a hollow channel therethrough, and a first lens positioned adjacent to the distal end for receiving a first image in a first direction along the longitudinal axis. The method comprises interposing the shaft within the hollow cavity, inserting a catheter into the hollow channel, extending the catheter inside the hollow channel to advance a distal section thereof and a coupled second lens to a position adjacent to the distal end, actuating a bending section thereof to achieve retroflexion of the distal section such that the second lens is positioned to receive a second image in a second direction generally opposite to the first direction.