Case 56. 

Liver lesion in a wild rat (Clethrionomys rufocanus bedfordiae) in Hokkaido
　 　 　 　
　 Invasive multilocular cysts in the liver contain numbers of protoscolex (HE, low power). 　
　 　 　 　

　

 　 Exogenous budding is characteristic of multilocular echinococcosis. Wild rats are the reservoir (intermediate host) of E. multilocularis.