Gianfranco Varetto, Paolo Garneri, Claudio Castagno, Valentina Molinaro, Simone Quaglino, Matteo Ripepi, Emilio Benintende, Lorenzo Gibello, Stefano Zan, Luigi Contessa, Ugo Bertoldo, Pietro Rispoli Vascular Surgery, Department of Surgical Sciences, University of Turin, Turin, Italy Abstract: Venous ultrasonography is an indispensable tool in minimally invasive surgery for the treatment of varicose veins. However, the criteria for defining preoperative imaging parameters, outcome monitoring, and follow up are not well characterized. In this retrospective study, we reviewed the ultrasound periprocedural parameters and the outcomes in 274 patients (280 limbs) after endoluminal laser treatment, at early (