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. 2016 Oct 13;49(6):570–574. doi: 10.5946/ce.2016.022

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Copyright © 2016 Korean Society of Gastrointestinal Endoscopy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 4. — Gross findings after formalin fixation. (A). A well-defined heterogenous yellow-white solid duodenal mass can be observed on the specimen section. The gross endoscopic resection specimen showed a large duodenal lesion measuring 9.3×2 cm. (B) Microscopic findings. Light microscopy revealed hyperplastic lobules of proliferating Brunner's glands separated by fibrous septum. (H&E stain, ×40). (C) Brunner's gland hyperplasia composed of variable size of Brunner’s glands (H&E stain, ×100) can be observed.