Rare cystic liver lesions: A diagnostic and managing challenge

Table 2 World Health Organization-Informal Working Group on Echinococcosis

Type	Ultrasonographic features and patterns
CL	Unilocular cystic lesion with uniform anechoic content, cyst wall not visible
CE1	Unilocular cystic lesion with uniform anechoic content, cyst wall visible, snowflake sign
CE2	Multivesicular, multiseptated cysts, daughter cysts present, honeycomb sign
CE3	Unilocular cyst containing liquid with a floating membrane inside, daughter cysts may be present, water-lily sign
CE4	Cysts with heterogeneous hypoechoic or hyperechoic degenerative contents, no daughter cysts
CE5	Cysts characterized by a thick calcified wall, which is arch-shaped, producing a cone-shaped shadow; degree of calcification varies from partial to complete