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Histopathological examination (a–b). (a) Hematoxylin and eosin (H&E) staining for the site where the mucosa with irregular surface. The magnification of the micrograph is 40×. (b) Higher magnification (200×). (a) Papillary epithelium is growing in the gallbladder. (b) The mucosa is observed with no mitotic figures or atypia, and it is judged that it is not a malignant disease.
