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An airway blockage also can cause atelectasis. A blockage may be due to a foreign object (such as an inhaled peanut), a mucus plug, lung cancer, or a poorly placed breathing tube from a ventilator. When a blockage occurs, the air that's already in the air sacs is absorbed into the bloodstream.
Usually seen in tension pneumothorax, pleural effusion, abdominal distention and intrathoracic lesions, this occurs when pleural pressure seizes the lungs, keeping it near the chest wall. As the pressure disappears, the lung eventually recoils, causing atelectasis. This is also coined as passive atelectasis.