Table 2. Situations requiring conversion to open.

Reasons for conversion	Description of the reasons for conversion
Inadequate deflation of lung (anaesthetic reasons)	Intubation related to difficulties (could not achieve lung isolation)
	Not tolerating low tidal volume using SLT with DLV
	Not tolerating carbon dioxide insufflation (in DLV)
Visibility issues detected intra-operatively	Small thoracic cage compared to tumor size
	Intraoperative bleeding
	Congenital deformities
Locally advanced tumors	Extensive contact/dense adhesions/involving great vessels
Experience	Early part of learning curve (prolonged duration of surgery)

SLT, single lumen tube; DLV, double-lung ventilation.