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The advantage of endoscopic ultrasonography (EUS) is its high resolution and capability of local observation [1] [2]. It is one of the most accurate diagnostic methods, particularly for the pancreatobiliary region, where various advanced imaging diagnostic methods available today, such as CT and MRI [3] [4]. Since EUS is most useful for diagnosing a small lesion, its usage for early diagnosis of pancreatobiliary cancer has being anticipated.
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Maguchi et al. (2006) studied this question.
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