Hepatic echinococcosis, also known as hepatic echinococcosis, is a common parasitic disease in animal husbandry areas. It is a parasitic disease caused by the cystic larvae (echinococcosis) of the dog tapeworm (Echinococcus) parasitizing in the liver. The disease is caused by Echinococcus granulosus, Echinococcus multilocularis or Echinococcus alveolaris. There are two types of hepatic echinococcosis: one is unilocular echinococcosis (i.e. hydatid cyst) caused by infection with Echinococcus granulosus eggs; the other is alveolar echinococcosis or follicular hepatic echinococcosis caused by infection with multilocular or alveolar Echinococcus. Unilocular echinococcosis is more common in clinical practice. It is prevalent in animal husbandry areas such as Northwest my country, Inner Mongolia, and western Sichuan.