Abstract
Underwater endoscopic mucosal resection (UEMR) is rapidly gaining popularity as a treatment that is easier than conventional EMR and endoscopic submucosal dissection (ESD) because submucosal injection is not necessary owing to the floating effect of tissue under water [1] [2]. However, it is currently unclear whether UEMR can ensure deep enough margins for pathological evaluation of early-stage colorectal cancer [3]. We present a case of modified UEMR with submucosal injection after underwater conditions have been established (UIEMR).
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