Case 73. Actinomycosis of lung (50 y-o F)

　 　 　 　
　 Surgical specimen of an irregular-shaped lung nodule in a previously healthy individual 　
　 　 　 　

　

 　 The grains are composed of clustered thin bacteria and homogeneous matrix called Splendore-Hoeppli material (HE, high power). Neutrophilic reaction is evident.