Case 107. Peptostreptococcus-induced brain abscess (79 y-o M)

　 　 　 　
　
Biopsy from a cavity-forming cerebrocortical lesion
 　
　 　 　 　

　

 　 Small-sized, Gram-positive cocci are clustered within the abscess cavity (Gram). The cocci are much smaller than Staphylococcus aureus or Streptococcus pyogenes.