Target Volume Determination 2015

N-STAGING

PET has relatively poor sensitivity (50%) but high specificity (85%), and is useful in detecting diseased nodes distant to the tumour

EUS uses several criteria, i.e. size, shape, echogenicity, and borders, with an overall accuracy of 75-85% for local nodes.

CT uses size criteria for depiction of nodal disease, with an overall accuracy of only 45-60%.