Pathological evaluation of gastrointestinal endoscopic submucosal dissection materials based on Japanese guidelines

Figure 1 Endoscopic submucosal dissection materials with incidental lesions not found before treatment. These cases are found in a percentage of endoscopic submucosal dissection materials. The incidental lesion shows a positive margin. It should be kept in mind that a lesion may not be single but multiple in endoscopic submucosal dissection specimens. This accurate mapping of the lesion is helpful to make a treatment strategy after endoscopic submucosal dissection specimen.