Delayed perforation is a very rare complication of endoscopic submucosal dissection (ESD), with a reported incidence of 0.1% to 0.45%. Few reports exist on the clinical features and outcomes of delayed perforation after ESD, and it is unclear whether the optimal management strategy is emergency surgery or endoscopic closure with conservative treatment. Here, we report two cases of delayed perforation occurring after ESD for early gastric cancer. In both cases, lesions were located in the antrum, and tumor depths were confined to the mucosal layer. Total procedure times for ESD were 25 and 45 minutes, respectively. Because delayed perforation may be associated with excessive thermal damage and necrosis of the muscle layer, treatment with emergency surgery should be used instead of conservative management in cases of delayed perforation after ESD.

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