A unique system for the correlation between removed lymph nodes for lung cancer diagnosis and pathological analysis thereof is provided. The upper shroud has an upper steering shaft passage portion that is positioned vertically, axially and angularly relative to the upper steering shaft. By supplying a laser beam emitted from the laser light source to the light guiding plate units via the connection portion, the display surfaces of the liquid crystal display panel units are illuminated by the laser beam. The controller is coupled with a setting unit for setting various parameters which are stored in a parameter storage unit for controlling the controller.