Case 237. 

Panel 10: Contamination of non-pathogenic microbes
　 　 　 　
　
Rods in the aspirated bone marrow (HE).
 　
　 　 　 　

　

 　 Large-sized rods (probably spore-forming Clostridia) are seen in the aspirated specimen. There are no host response, so that this should be regarded as contamination during specimen handling.