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Injury is generally defined as morphological changes due to physical or chemical stress, inflammatory or repair process, or secondary events of the other disease. In the nontraumatic injuries of the lung, direct physical effects to the lung such as contusion or rupture of the lung must be excluded. So, the types of nontraumatic injuries of lung are all pathologic changes of lung except for congenital anomalies; infectious of inflammatory disease, aspiration induced injuries, environmental or occupational lung disease, postoperative pulmonary changes, poison or drug induced toxic injuries, radiation injury, etc...
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