ポリペクトミー，EMRから始まった大腸腫瘍に対する内視鏡治療は，様々な技術や機器の開発によって一定の到達点に至ったと思われていた．しかしESDの出現により内視鏡治療適応病変の幅が広がり，さらにCold PolypectomyやUnderwater EMR，Tip-in EMRなど，さらなる治療成績の向上のための工夫が報告されている．さらに拡大内視鏡診断に加えEUS診断能も向上し，縫合手技も開発されたことからPAEMや全層切除も含め，現在大腸腫瘍に対する内視鏡治療は大きな転換点を迎えている．本セッションではさらなる新しい治療法の工夫など最新の治療技術について幅広く供覧していただきたい．ビデオセッションのため実際の処置の際のコツや注意点などを中心に動画で詳しく提示していただき，すぐに日常診療で役に立つようなセッションになることを期待する．

Endoscopic treatment of colorectal neoplasms, which began with polypectomy and endoscopic mucosal resection (EMR), was initially believed to have reached a plateau, largely due to advances in techniques and equipment. However, with the advent of endoscopic submucosal dissection (ESD), the indications for endoscopic treatment of colorectal neoplasms have significantly expanded. Furthermore, newer techniques such as cold polypectomy, underwater EMR, and tip-in EMR have been introduced, showing potential to further enhance treatment outcomes. In addition to these advancements, the diagnostic accuracy of endoscopic ultrasound (EUS) has improved, alongside innovations in magnifying endoscopy. Furthermore, the development of suturing techniques has enabled more complex procedures, including per-anal endoscopic myectomy (PAEM) and full-thickness resection, marking a major turning point in endoscopic treatment for colorectal neoplasms. In this video session, we aim to explore the latest treatment modalities, highlighting recent innovations and their practical applications. We will focus on key procedural tips and precautions to ensure that these techniques can be effectively implemented in routine clinical practice.