Abscess formation or pus accumulation within the brain tissue.
From Greek enkephalos (brain) + pyon (pus) + -osis (condition or abnormal state). The pyo- prefix appears in many medical terms related to infection and pus, like pyogenic and empyema.
Brain abscesses (encephalopyosis) are terrifyingly rare but deadly—pus pockets in the brain take up space that literally pushes on vital structures, which is why even small brain infections demand emergency surgery.
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