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.

atelectasis, and pleural effusion. For our analysis, chest radiographs were categorized into 4 groups: (1) "No acute disease" (NAD) (ie, clear or no change from prior radiographs); (2 ...