An alternative plural form of empyema, using the Greek plural ending instead of the English plural.
From Greek medical terminology where '-mata' is the standard neuter plural ending (like 'phenomena' from 'phenomenon'). Medical language often preserves classical plural forms.
The existence of both 'empyemas' and 'empyemata' shows how medical professionals sometimes choose to preserve Greek plurals to sound more authoritative or classical—it's a linguistic reminder that medicine borrowed heavily from ancient Greek and Latin.
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