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Colorectal Cancer Surgical Treatments / Endometrial and Cervical Cancer Treatments / Colorectal and Anal Carcinomas · Journal article
Frontiers in Surgery · August 17, 2026
Early or partial results. Treat as a signal, not a conclusion.
This retrospective single-centre study documents that formalin fixation reduces distal resection margin length by a mean of 13.2% (absolute reduction 0.49 cm) in rectal cancer specimens. The finding is technically sound but observational; it raises awareness of measurement discrepancy without establishing clinical significance or outcome impact.
Retrospective cohort study. Patients with rectal cancer undergoing anterior or low anterior resection at a single tertiary centre between [dates redacted]; median age 65.5 years (range 42–81); 83% underwent low anterior resection; 57% received neoadjuvant chemoradiotherapy.. Intervention: Formalin fixation of fresh rectal cancer resection specimens. Compared with: Fresh specimen margins measured intraoperatively. n = 60. Single tertiary centre (country and site name redacted in abstract).
Mean intraoperative distal resection margin 4.39 cm; mean after fixation 3.90 cm Average absolute margin reduction of 0.49 cm corresponding to mean shrinkage of −13.2% Shrinkage range 0% to 70% across the cohort
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
Clinicians should recognize that pathological margin measurements after fixation may underestimate true intraoperative margins by ~13% on average, particularly relevant when margins appear marginal or in low anterior resections. However, the clinical significance—whether this discrepancy changes margin adequacy thresholds or patient outcomes—remains unstated and requires prospective validation.
Single-centre retrospective measurement study with no clinical outcome; demonstrates a technical phenomenon (tissue shrinkage) but lacks comparison to patient safety or oncological adequacy thresholds.
As stated by the source record.
Quoted from the source exactly as published.
Clinicians should recognize that pathological margin measurements after fixation may underestimate true intraoperative margins by ~13% on average, particularly relevant when margins appear marginal or in low anterior resections. However, the clinical significance—whether this discrepancy changes margin adequacy thresholds or patient outcomes—remains unstated and requires prospective validation.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Abstract. Background The adequacy of the distal resection margin (DRM) remains a central concern in rectal cancer surgery. However, the interpretation of margin length may be confounded by tissue shrinkage after resection and fixation. Methods We retrospectively reviewed 60 patients who underwent anterior or low anterior resection for rectal cancer between XXXX and XXXX at a single tertiary center. Distal margins were measured intraoperatively on fresh specimens (BF) and remeasured after formalin fixation (AF). Shrinkage was calculated as the percentage change between AF and BF. Demographic variables, surgical procedure, tumor level, and neoadjuvant chemoradiotherapy were analyzed for associations with shrinkage. Results The median age of the cohort was 65,5 years (range: 42–81), and 83% of patients underwent low anterior resection. Neoadjuvant chemoradiotherapy was given to 34 patients (57%). The mean intraoperative DRM was 4,39 cm, while the mean fixed DRM was 3,90 cm, corresponding to an average absolute reduction of 0,49 cm and a mean shrinkage of − 13,2%. Shrinkage ranged from 0% to 70%. Subgroup analyses showed no significant differences according to surgery type, sex, age, or neoadjuvant therapy. Conclusion Formalin fixation leads to measurable shortening of distal margins in rectal cancer specimens. Pathological measurements may underestimate the intraoperative margin, an important consideration particularly in low anterior resections. Surgeons should be mindful of this discrepancy.
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