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Cryptogenic organizing pneumonia (COP)-bronchiolitis obliterans

Involvement of a terminal airway with a polypoid nodule of immature connective tissue and fibroblasts identical to the lesions seen withn alveoli and alveolar ducts. This type of involvement of small airways is termed bronchiolitis obliterans.

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Uploaded on June 25, 2010
Taken on October 7, 2008