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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.
Obstructive atelectasis may be caused by: Mucus plug. Accumulation of mucus in your airways, often occurring during and after surgery because you can't cough, is a common cause of atelectasis. Drugs given during surgery make the lungs inflate less fully than usual, so normal secretions collect in the airways.