pleural cavity n the space that is formed when the two layers of the pleura spread apart called also pleural space
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the space between the visceral and parietal pleura, which is normally very small as the pleural membranes are in close contact. The introduction of fluid (pleural effusion) or gas separates the pleural surfaces and increases the volume of the pleural space.
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cavitas pleuralis.Medical dictionary. 2011.