Hepatic hydatid cyst disease in low- and middle-income countries: Spectrum of imaging findings and complications

Figure 1 Ultrasound images showing the World Health Organization–Informal Working Group on Echinococcosis classification of hydatid cysts (cystic echinococcosis 1-3). A: Cystic echinococcosis (CE) 1 hydatid cyst with the presence of echogenic fine “hydatid sand” (arrows); B: CE2 hydatid cysts with the presence of peripheral daughter cysts (arrows); C: Internal detached membranes within a CE3a-type cyst (arrows); D: CE3b hydatid cysts with internal membranes, daughter cysts and a central solid maternal matrix (arrows).