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The model of biopsy side down aspiration for treatment of pneumothorax. (A) Air tends to leak when aspiration is performed near the initial biopsy site because of increased alveolar-to-pleural pressure gradient. (B) The “dependent atelectasis”, which occurs in biopsy side down position, provides a physical barrier to further air leakage, and the aspiration does not increase the alveolar-to-pleural pressure gradient around the puncture site.
