Show Notes
This episode provides a comprehensive review of pre-operative evaluation and staging for colorectal cancer, emphasizing the shift toward highly reproducible imaging and personalized risk stratification. We detail screening methods and clarify when pre-operative biopsy is mandatory (absolutely required for rectal tumors to obtain immediate MMR testing). We establish the modern definition of the rectum using fixed MRI bony landmarks (sacral promontory to symphysis pubis), superseding the variable 12 cm rule. A major focus is placed on using high-resolution MRI to assess the Circumferential Resection Margin (CRM) and detect Extramural Vascular Invasion (EMVI), the single most critical predictors of local recurrence. We review key AJCC 8th edition staging nuances, including N1C tumor deposits, which automatically upstage disease. We define the clinical "Good, Bad, and Ugly" risk stratification groups, emphasizing that threatened CRM or definite EMVI constitute the high-risk "Ugly" group mandating aggressive Total Neoadjuvant Therapy (TNT). The episode concludes by detailing essential pathological biomarkers—including tumor budding, LVI, and the Lymph Node Ratio (LNR)—which inform systemic adjuvant decisions, particularly following the conclusions of the IDEA trial.
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