Assertion: pneumothorax's cause | /r/HasProperty | cystic fibrosis
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text: Most secondary spontaneous pneumothoraces are secondary to chronic obstructive lung disease (COPD), although other classical causes of secondary spontaneous pneumothorax include tumor, sarcoidosis, tuberculosis, interstitial lung disease, cystic fibrosis, Langerhans cell histiocytosis, lymphangioleiomyomatosis, Birt-Hogg-Dube syndrome and pulmonary infections.