 Particular veins of the ( DVS ) and the ( SVS ) are looked at . The great saphenous vein ( GSV ) is a superficial vein which connects with the small saphenous vein ( SSV ) to drain into the common femoral vein ( CFV ) . Perforator veins drain superficial veins into the deep veins . Three anatomic compartments are described ( as networks ) , ( N1 ) containing the deep veins , ( N2 ) containing the perforator veins , and ( N3 ) containing the superficial veins , known as the saphenous compartment , . This compartmentalisation makes it easier for the examiner to systematize and map . The GSV can be located in the saphenous compartment where together with the Giacomini vein and the accessory saphenous vein ( ASV ) an image resembling an eye , known as the ' eye sign ' can be seen . The ASV which is often responsible for varicose veins , can be located at the ' alignment sign ' , where it is seen to align with the femoral vessels . Together with the GSV and the CFV these three veins create an image called the ' Mickey Mouse ' sign . The examination report will include details of the deep and the superficial vein systems , and their mapping . The mapping is drawn on paper and then drawn on the patient before surgery . 
