title: Preoperative duplex imaging is required before all operations for primary varicose veins.
authors.forename: S G
authors.initials: SG
authors.lastname: Darke
mesh_terms: D006801:Humans; D011300:Preoperative Care / Q000295:instrumentation; D012501:Saphenous Vein; D018616:Ultrasonography, Doppler, Duplex / Q000295:instrumentation*; D014648:Varicose Veins / Q000000981:diagnostic imaging*; D014689:Venous Insufficiency / Q000000981:diagnostic imaging