Target Volume Determination 2015

Mesorectal nodes

§ Relationship to CRM not so important § Positive nodes within 1mm of CRM not strong predictor of local recurrence (vs. direct tumour spread) § Main risk is 4 or more +ve nodes (N2) § N1 (1-3 +ve)

<1mm

Shihab et al Br J Surg 2010