The evolving paradigm of anastomotic leak assessment: From clinical suspicion to quantitative precision

The diagnosis of anastomotic leak (AL), a devastating complication of gastrointestinal surgery, has long been hampered by a reactive paradigm reliant on non-specific clinical signs and imperfect imaging, leading to critical delays. This review synthesizes evidence for a fundamental paradigm shift towards a proactive, quantitative framework for AL management, integrating objective data across the entire perioperative continuum. This approach encompasses preoperative risk stratification, intraoperative perfusion assessment and technical evaluation using novel technologies, and dynamic postoperative biomarker monitoring. We argue that the full potential of this paradigm is realized only through the systematic integration of these elements into a cohesive clinical pathway, facilitated by standardization initiatives. While this quantitative paradigm holds considerable promise, it is imperative to view it as an evolving set of tools to mitigate—rather than guarantee the elimination of—risk, pending further validation and standardization. Despite persistent challenges, this integrated quantitative pathway may represent a step toward reframing AL from a dreaded complication into a more modifiable event, potentially contributing to the evolution of precision surgery and improved patient outcomes.