NCIt definition : The collapse of part or the entire lung due to airway obstruction, infection, tumor,
or general anesthesia.;
Alternative definition : NCI-GLOSS: Failure of the lung to expand (inflate) completely. This may be caused
by a blocked airway, a tumor, general anesthesia, pneumonia or other lung infections,
lung disease, or long-term bedrest with shallow breathing. Sometimes called a collapsed
lung.; CDISC: The partial or total collapse of alveoli and/or airways.; CTCAE: A disorder characterized by the collapse of part or the entire lung.; NICHD: The collapse of alveoli and small airways.;