Hemothorax : accumulation of blood in the pleural cavity ( the space between the lungs and the walls of the chest ) 血胸：各种原因所致的胸膜腔内积血、肺萎陷称为血胸。
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The right lung is atelectatic and floating in bloody fluid filling the right chest cavity as a consequence of trauma . this is a hemothorax 图示血胸。外伤后，大量出血，充满胸膜腔，使右肺萎陷，并在血性液体中飘浮。
