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Atelectasis:
poor diaphragmatic excursion, hypoventilation, PE;
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Atelectasis: central obstruction �
endobronchial mass (bronchogenic CA, mucus plug, foreign body), extrinsic mass (large lymph nodes, large heart, aneurysm, mediastinal mass);
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Atelectasis: peripheral obstruction �
pneumonia, post-surgery (LLL after cardiac surgery);
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Atelectasis: compression �
pleural effusion, PTX;
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Atelectasis: contraction �
scarring from chronic TB or any pulmonary fibrosis
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Complete opacification of one hemithorax:
complete atelectasis (bronchogenic CA, mucus plug, ETT too low), large effusion (mets, lymphoma), prior pneumonectomy, malignant mesothelioma, unilateral pneumonia or pulmonary edema
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