Endoscopic submucosal dissection (ESD) allows en bloc removal of large GI-tract lesions.1-3 However, removal of large tumors creates big mucosal defects, which can cause delayed bleeding and delayed perforation.4-6 In addition, resection of circumferential or nearly circumferential tumors can result in subsequent stenosis, requiring endoscopic dilation, placement of stents, or even surgical correction.7-10