A system for illumination during a corridor based procedure is provided, comprising: a light source； and, an optical probe comprising: a tube having a distal end, a proximal end and one or more sidewalls there between, the optical probe and the light source arranged so that light from the light source is received by the one or more sidewalls, the one or more sidewalls configured to convey the light to the distal end, the distal end configured to receive the light and illuminate a sample adjacent thereto.
