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Classification and external resources
ICD-10 J86.9
MedlinePlus 000123
MeSH D004653

An empyema (from Greek ἐμπύημα, "abscess") is a collection or gathering of pus within a naturally existing anatomical cavity. For example, pleural empyema is empyema of the pleural cavity. It must be differentiated from an abscess, which is a collection of pus in a newly formed cavity.


In human medicine, empyema occurs in: