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N Staging - MDCT
•CT - high specificity, but low
sensitivity
•Based on size criteria (short axis):
≥6mm perigastric
≥ 8mm extra perigastric
≥10mm mediastinum
Stage
No of Regional
Nodes
N1
≤2
N2
3-6
N3
≥7
Accuracy of N staging
Oesophageal Cancer
68%*
Gastric Cancer
67%
†
* Davies, A. R., D. A. Deans, et al. (2006). Dis Esophagus
19
(6): 496-503
†Hur, J., M. S. Park, et al. (2006). J Comput Assist Tomogr
30
(3): 372-7.