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. 2017 Dec 7;23(45):7989–7999. doi: 10.3748/wjg.v23.i45.7989

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©The Author(s) 2017. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

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Migration of the protoscolices in the portal vein and liver. The path and course of the protoscolex migration in the portal vein and liver were tracked by open examination, pathology, and ultrasound. When the human Echinococcus granulosus protoscolices were injected, they travelled from small branches of the portal vein to the liver with the blood flow, causing inflammatory cell infiltration. When the hydatid cyst formed, the infected liver presented the infection zone around the parasite lesion. The open examination showed the distribution and cyst abundance in the livers of groups A, B, and C. After 4 mo, ultrasound detected spherical, fibrous rimmed cyst with surrounding host reaction. After 6 mo, the even larger parent cyst with satellite daughter cysts within or outside the parent cyst was found.