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Ultrasound appearance of CE4 (A) and CE5 (B) cyst of the liver. The “ball of wool” appearance of the hyperechoic folded laminated layer in the iso-hyperechoic cyst content is characteristic of the CE4 stage. Complete or near-complete egg-shell calcification of a cyst with the same content appearance is characteristic of the CE5 stage. CE = cystic echinococcosis.
