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Phlegmonous gastritis is a rare but often fatal acute pyogenic infection of the stomach. We herein report three cases of phlegmonous gastritis with different causes: the long-term placement of a nasogastric feeding tube, bacteremia associated with cellulitis in a diabetic patient, and an adverse reaction to paclitaxel/carboplatin chemotherapy for cancer of unknown primary cause, which were classified as primary, secondary, and idiopathic types, respectively. Coping with the increasing morbidity rate associated with the diverse background of such patients requires a thorough understanding of the clinical features and image findings associated with this entity.

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This single-center retrospective study indicated that ESD-induced artificial ulcer healing was affected by submucosal fibrosis and injury of the proper muscle layer, which induced damage to the muscle layer. Therefore, the preferable pharmacotherapy can be determined on completion of the ESD procedure.