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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.
Atelectasis, or collapse of the small air sacs in the lungs, is typically caused by a blockage of the airways or pressure on the outside of the lungs. Specific causes of airway blockage and lung pressure include: Accumulation of mucus in the airways.Blood clot. Blow to the chest caused by a fall or car accident.telectasis, or collapse of the small air sacs in the lungs, is typically caused by a blockage of the airways or pressure on the outside of the lungs. Specific causes of airway blockage and lung pressure include: Accumulation of mucus in the airways.