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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.
To diagnose atelectasis and determine the underlying cause, your doctor may order tests, including: Chest X-ray. A chest X-ray usually can diagnose atelectasis. Occasionally, a foreign body, a common cause of obstructive atelectasis in children and adults, may be seen on this type of imaging. CT scan. CT is more sensitive than plain X-ray in detecting atelectasis because it can measure lung volumes in all or part of a lung. A CT scan can also help determine whether a tumor may have caused your lung to collapse â something that may not show up on a regular X-ray. Oximetry.