Retrospective study comparing rectal endoscopic submucosal dissection with and without Foley catheter drainage tube placement.

Background and study aims: Endoscopic submucosal dissection (ESD) is a minimally invasive and effective treatment for rectal tumors but maintaining a clear surgical field during the procedure is challenging, especially for novice operators. This study aimed to investigate whether continuous drainage using a Foley catheter could enhance efficiency and safety of rectal ESD performed by novice endoscopists under expert supervision. Patients and methods: This retrospective study involved 26 patients who underwent rectal ESD between March 2023 and October 2024. Patients were divided into two groups: those who received continuous drainage with Foley catheter placement (n = 12) and those who did not (n = 14). Key outcomes evaluated were dissection speed, total procedure time, R0 resection rates (complete tumor resection with clear margins), and occurrence of any adverse events (AEs) during or after the procedure. All procedures were performed by novice endoscopists under expert guidance. Results: The results showed that dissection speed was significantly higher in the Foley catheter group, with a median of 18.6 mm²/min compared with 10.5 mm²/min in the non-catheter group ( Conclusions: Foley catheter placement notably improved efficiency of rectal ESD performed by novice endoscopists, particularly by increasing dissection speed. This technique may contribute to safer and more effective ESD. However, larger studies are needed to confirm these findings and further assess their benefits.