Hemothorax
（重定向自Haemothorax）
![Hemothorax in an animal](/Images/godic/202501/16/Hémothorax1235.jpg")
A hemothorax (hemo- + thorax) (or haemothorax/Haemorrhagic pleural effusion) is a type of pleural effusion in which blood accumulates in the pleural cavity. This excess fluid can interfere with normal breathing by limiting the expansion of the lungs.