45 year old man with focal neurologic deficits, headache and fever for several weeks.
Cerebrospinal fluid (CSF) analysis showed increase in white cell count, elevated protein concentration but normal glucose content.
The affected cerebral hemisphere is swollen. Cut surface shows a large well-defined cavity (due to liquefactive necrosis and suppuration) lined by a layer of creamy fibrinopurulent exudate resting on a collagenous capsule.
There is compression but no rupture into the lateral ventricle.