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

　 　 　 　
　
Biopsy from a cavity-forming cerebrocortical lesion
 　
　 　 　 　

　

 　 The abscess cavity is filled with neutrophils (HE, low power). The causative microbe, Peptostreptococcus sp., is an anerobic normal flora of the oral cavity