Colapex lung expand of lung incomplete expansion of alveoli. In atelectasis, the
bronchioles and alveoli (pulmonary parenchyma) resemble a collapsed balloon. Common causes of atelectasis include poor inspiratory effort after surgery, blockage of a ronchus or smaller bronchial tube y secretions, tumor, and chest wounds that permit air, fluid, or blood to accumulate in the pleural cavity. Acute atelectasis requires removal of the underlying cause (tumor, foreign, body, mucous plug) and therapy to open airways. Respiration also can be limited by pain.