...Where there is an excess of air in thechest cavity, as in emphysema or in pneumothorax, the percussion sound becomesabnormally loud and clear...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...An accumulation of gas in the pleural sac is known as pneumothorax...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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