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Background/Aims: This study aimed to examine the diagnostic ability of endoscopic ultrasonography (EUS) for major vascularinvasion in pancreatic cancer and to evaluate the relationship between EUS findings and pathological distance. Methods: In total, 57 consecutive patients who underwent EUS for pancreatic cancer before surgery were retrospectively reviewed. EUSimage findings were divided into four types according to the relationship between the tumor and major vessel (types 1 and 2: invasion,types 3 and 4: non-invasion). We also compared the EUS findings and pathologically measured distances between the tumors andevaluated vessels. Results: The sensitivity, specificity, and accuracy of EUS diagnosis for vascular invasion were 89%, 92%, and 91%, respectively, in theveins and 83%, 94%, and 93%, respectively, in the arteries. The pathologically evaluated distances of cases with type 2 EUS findings weresignificantly shorter than those of cases with type 3 EUS findings in both the major veins (median [interquartile range], 96 [0–742] µmvs. 2,833 [1,076–5,694] µm, p=0.012) and arteries (623 [0–854] µm vs. 3,097 [1,396–6,000] µm, p=0.0061). All cases with a distance of≥1,000 µm between the tumors and main vessels were correctly diagnosed. Conclusions: Tumors at a distance ≥1,000 µm from the main vessels were correctly diagnosed by EUS.

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