Preoperative Localization, Margins, and Intraoperative Endoscopy in Minimally Invasive Sigmoid Colectomy: A…

Cohort studyThe Journal of surgical research· Nov 2025

Preoperative Localization, Margins, and Intraoperative Endoscopy in Minimally Invasive Sigmoid Colectomy: A Matched Cohort.

Chang-Lin Lin, Feng-Fan Chiang, Ming-Cheng Chen … Ching-Shiang Lin

Colon & Rectal SurgeryCohort studyClinical practiceQ2IF 1.6

Preoperative tumor localization associated with wider resection margins in sigmoid colectomy.

Preoperative Localization, Margins, and Intraoperative Endoscopy in Minimally Invasive Sigmoid Colectomy: A Matched Cohort.

Chang-Lin Lin … Ching-Shiang Lin

The Journal of surgical research · Nov 2025 · Q2 in Surgery

Background

Preoperative localization (endoscopic tattoo or clip) is widely used in laparoscopic colorectal surgery to guide resection margins, yet its influence on long-term outcomes is uncertain.

Methods

We retrospectively reviewed elective minimally invasive sigmoid colectomy at a single center from January 2016 to December 2019.

n = 99 matched pairs

Results

localization widened surgical margins by about a centimeter

4cm

Localization

3cm

No Localization

More results

Five-year OS (89.7% versus 89.2%, P = 0.38) and DFS (82.0% versus 72.7%, P = 0.09) were similar between groups.

Margin length showed limited prognostic value (OS area under the curve, 0.592; DFS area under the curve, 0.541).

“

Conclusion · 1 of 2

Localization during minimally invasive sigmoid colectomy was associated with wider resection margins and a lower frequency of intraoperative colonoscopy.

Conclusion · 2 of 2

No statistically significant differences were observed in 5-year OS/DFS; the study was not powered to detect small survival differences.

Preoperative Localization, Margins, and Intraoperative Endoscopy in Minimally Invasive Sigmoid Colectomy: A Matched Cohort.

Preoperative Localization, Margins, and Intraoperative Endoscopy in Minimally Invasive Sigmoid Colectomy: A Matched Cohort.

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