Background: In a previous study of 1,081 limbs affected with varicose recurrence (VR) at the saphenofemoral junction (SFJ) and at the sapheno-popliteal junction (SPJ), the anatomical causes were investigated. VR appeared to be due to inadequate diagnosis and surgery; neoangiogenesis appeared to play a minimal role. The so-called cavernoma was secondary to reflux and consisted with a complex collateral circulation (CC). Only 52 of 1,081 (4.8%) studied limbs developed a VR at the SPJ, but the anatomical findings were poorly described. The aims of this study were: 1) to distinguish between VR at the SPJ and the ones caused by different sources of reflux, 2) the reliability of the preoperative DUS examination, and 3) the efficacy and safety of the treatment.