1. empyema
Wikipedia definition
2. EmpyemaAn empyema is a collection of pus within a naturally existing anatomical cavity, such as the lung pleura. It must be differentiated from an abscess, which is a collection of pus in a newly formed cavity. In human medicine, empyema occurs in: the pleural cavity (pleural empyema also known as pyothorax) the thoracic cavity the uterus the appendix the meninges the joints the gallbladder the brain
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