No: Lungs may collapse for a variety of reasons, including trauma, blebs, bullae, increased pressure in the lungs, etc. While a pneumothorax may occur because of a bulla, it does not cause them.
Answered 12/23/2014
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Other way: Bullae can rupture leading to pneumothorax (air outside lung) which can then collapse the lung.
Answered 8/15/2015
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