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Prevalence of malignancy was defined as the presence of a gallbladder carcinoma and/or cholangiocarcinoma at the time of diagnosis or an incidental finding during surgery without previous intervention. Prevalence of malignancy is the primary risk of malignancy in choledochal malformation and can be considered as risk of malignancy according to the natural history of disease. Malignant transformation was defined as the development of a cholangiocarcinoma following a surgical drainage procedure or formal excision of the choledochal malformation.
Copyright and License information: ©2018 The Authors. published by John Wiley & Sons Ltd on behalf of BJS Society Ltd.
This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
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