Background: Repeat preoperative endoscopy is common for patients with colorectal neoplasms. This can result in treatment delays and risks of colonoscopy-related complications. Repeat preoperative endoscopy has been attributed to poor communication between endoscopists and surgeons. In January 2019, mandatory electronic synoptic reporting for endoscopy was implemented to include elements consistent with quality indicators proposed in national guidelines. The aim of the present study is to assess whether the repeat preoperative endoscopy rate for colorectal lesions changed following synoptic report implementation. Methods: A retrospective review was performed of all patients who underwent elective surgical resection for colorectal neoplasms from January 2007 to June 2020 at a tertiary hospital in Canada. Patients who had an index endoscopy documented via synoptic report were compared with those reported via narrative report. Primary outcomes were rates of repeat preoperative endoscopy and inclusion of colonoscopy quality indicators (e.g., photo-documentation, tattoo placement and bowel preparation score). A total of 1429 patients who underwent elective colorectal resection for colorectal cancers or polyps between January 2007 and June 2020 were included. Of these, 115 had index endoscopies recorded via synoptic report and 1314 by narrative report. The repeat preoperative endoscopy rate after endoscopies documented by narrative report was 29.1% (95% confidence interval CI 26.6%-31.6%) and 25.2% (95% CI 17.6%-34.2%) for synoptic report. Patients whose index endoscopies where performed by a practitioner other than their operating surgeon had a re-endoscopy rate of 36.0% (95% CI 32.8%-39.3%) after narrative report and 38.8% (95% CI 27.1%-51.5%) for synoptic report. Rates of tattoo placement, photo-documentation and reporting of bowel preparation quality were all significantly increased with synoptic reports (p ≤ 0.003). Conclusion: Endoscopy synoptic reports based on current guidelines were not associated with a decrease in rates of repeat preoperative endoscopy at a high-volume colorectal cancer centre. Future study should examine synoptic report contents for this purpose and make necessary modifications.