The investigators collected data on all consecutive patients who underwent ESD for recto-sigmoid laterally spreading tumors (LSTs) \>35 mm under SA between January 2021 and March 2024. The investigators evaluated the technical success and safety of SA in terms of ARAEs, and pain, measured via visual assessment scale (VAS).
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Technical success of ESD under SA
Timeframe: Immediately after the procedure
Safety of ESD under SA
Timeframe: periprocedurally