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EUS ability to discriminate between N+ (metastatic lymph nodes) and N0 (disease free lymph nodes) gastric carcinomas. Likelihood ratio (LR) scattergram defining quadrants of informativeness based on desirable thresholds (positive LR>10, negative LR<0.1): left upper quadrant (test suitable both for diagnosis exclusion and confirmation), right upper (confirmation only), left lower (exclusion only), right lower (neither confirmation nor exclusion).
