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Pneumothorax is defined as the presence of air in the pleural space due to: a) communication be- tween alveolar spaces and pleura; b) direct or indi- rect exchange of air between the atmosphere and the pleural space; or c) the presence of gas produc- ing organisms in the pleural space. From the clinical and etiological standpoint the pneumothorax ...
H Matthys (Tue,) studied this question.