Background: We aim to evaluate the transition process from open to video-assisted thoracoscopic surgery (VATS) anatomical segmentectomies in a regional thoracic surgical unit.Methods: In a retrospective study from January 2013 to December 2015, we identified all anatomical segmentectomies performed in our unit. Pre, peri and postoperative data were compared between the three years (2013, 2014 and 2015) and according to operative approach. Thoracotomy after VATS intraoperative biopsy was considered a conversion for the purposes of the study.