The sapheno-femoral junction (SFJ) is located at the saphenous opening within the groin and formed by the meeting of the great saphenous vein (GSV), common femoral vein and the superficial inguinal veins (confluens venosus subinguinalis).[1][2] It is one of the distinctive points where a superficial vein meets a deep vein and at which incompetent valves may occur.[3]