Figure 1

The ideal resection margin of bleb and bullae. The dotted line shows the ideal resection margin of ELC in the treatment of pneumothroax. The visible lesions which contain intraparenchymal cystic lesions are a part of ELC such as tip of ice burg. The wider resection of lung will be necessary for complete resection (figure 1a). On the other hand, the resection of visible lesion is enough in case that there was no intraparenchymal pathologic lesion (figure 1b).