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Atelectasis is collapse of lung tissue with loss of volume. Patients may have dyspnea or respiratory failure if atelectasis is extensive. They may also develop pneumonia. Pleuritic chest pain may be present with certain causes of atelectasis. Diagnosis is by chest x-ray.
By Mayo Clinic Staff. Atelectasis (at-uh-LEK-tuh-sis) â a complete or partial collapse of a lung or lobe of a lung â develops when the tiny air sacs (alveoli) within the lung become deflated. It's a breathing (respiratory) complication after surgery. Atelectasis is also a possible complication of other respiratory problems, including cystic fibrosis, inhaled foreign objects, lung tumors, fluid in the lung, respiratory weakness and chest injuries.