Pneumothorax Physiopedia Shoulder. Weakening in a small area of your lung (this most often happens in tall. Primary spontaneous pneumothorax usually occurs when a small weakened area of lung (bulla) ruptures.

Injuries most commonly associated with phfs include axillary, suprascapular, or brachial plexus. Pneumothoraces) refers to the presence of gas (often air) in the pleural space.