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Relationship to Circumferential
Resection Margin
MRI-defined MRF
corresponds to CRM*
Distance to MRF predicts
CRM involvement
≥5mm distance good
predictor of at least 1mm
histological margin
+
< 1mm cutoff : potentially
involved margin
+ +
*Bissett IP et al. Dis Colon Rectum 2001; 44: 259-65;
+
Beets-Tan RG et al. Lancet
2001; 357: 497-504;
+ +
Mercury study group. BMJ 2006; 333: 779.
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Systematic Approach