Medical Definition of hydropneumothorax
plural hy·dro·pneu·mo·tho·rax·es or hy·dro·pneu·mo·tho·ra·ces \-ˈthōr-ə-ˌsēz, -ˈthȯr-\play
: the presence of gas and serous fluid in the pleural cavity—called also pneumohydrothorax
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