<prompt> In Video assisted thoracoscooic surgery for better vision the space in the operative field is created by?Self retaining retractorCO2 insufflationsCollapse of ipsilateral lungRib spacing  <response>: Ans is c i.e. collapse of ipsilateral lung In contrast to most laparoscopic techniques, the working space for VATs is created not by adding an insuffalation gas but rather by removing air from the ipsilateral lung parenchyma causing collapse of the ipsilateral lung. 