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Conclusion:For assessing deeper invasion (T2, T3 and T4), EUS has been substantiated as a significantly effective tool. In staging T1b lesions, EUS was reasonably specific in ruling out sub-mucosal invasion; however, it had relatively poor sensitivity in identifying sub-mucosal invasion. Additionally, data validated endoscopic features suggesting superficial cancers including a tumor size , 2cm and the presence of Barrett's morphology. In patients with these findings suggesting superficial cancer, EUS rarely identified a deep cancer that warranted a change in management.

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