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“AORC” nomenclature framework for CE surgery. (A) (top) – Vocabulary and acronyms. AORC: acronym for Approach, Opening, Resection and Completeness; CE: cystic echinococcosis; OC: opened cyst; NOC: non-opened cyst. (B) (bottom) – A. Schematic structure of CE cyst: the CE cyst consists (from inside to outside) of the germinal layer, laminated layer and adventitial layer. B. Total cystectomy requires the resection of all three layers completely. C. Subtotal cystectomy requires the nearly total resection of all three layers; only parts of the adventitial layer are preserved because of surgical safety. D. Partial cystectomy refers to the incomplete resection of any of three layers (usually of the adventitial layer) due to technical and safety issue. E. Hepatectomy requires the en bloc resection of part of liver parenchyma, following the rules of hepatic resection.

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