The patient went on to have a drainage. 

Histology

The section shows a fragment composed of acutely inflamed granulation tissue bordering necrotic inflammatory debris consistent with the contents of an abscess.  Scattered Gram-positive cocci are identified. No fungal or acid-fast organisms are identified.  Acute cerebritis is noted in adjacent brain parenchyma. The features are of a bacterial abscess. No evidence of tumor is seen.

FINAL DIAGNOSIS: cerebral abscess.