title: Spontaneous pneumothorax. Two cases of obscure etiology.
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000150:complications* / Q000473:pathology; D008297:Male; D008654:Mesothelioma / Q000150:complications* / Q000473:pathology; D008875:Middle Aged; D010997:Pleural Neoplasms / Q000150:complications* / Q000473:pathology; D011030:Pneumothorax / Q000000981:diagnostic imaging / Q000209:etiology*; D011859:Radiography; D012507:Sarcoidosis / Q000150:complications* / Q000473:pathology