The procedure is performed with general anesthesia using a special endotracheal tube that allows intentional collapse of the lung ... for the remaining healthy lung to expand. For the first day or so, ...

Atelectasis (pronounced at-uh-LEK-tuh-sis) is a term for the partial or complete collapse of the small airways in the lungs. Atelectasis can be due to tumors growing in lung tissue or an airway.