You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Pneumothorax is not a usual occurance with which of the following conditions? and explain in detail?
The most common of secondary spontaneous pneumothorax is chronic obstructive pulmonary disease, which accounts for approximately 70% of cases. Other causes include diseases of the airways (chronic obstructive pulmonary disease, acute severe asthma, cystic fibrosis), infections of the lung (Pneumocystis pneumonia (PCP), tuberculosis, necrotizing pneumonia), interstitial lung disease (Sarcoidosis, idiopathic pulmonary fibrosis, histiocytosis X), connective tissue diseases (Rheumatoid ahritis, ankylosing spondylitis, polymyositis and dermatomyositis, systemic sclerosis, Marfan's syndrome and Ehlers-Danlos syndrome) and Ca bronchus.