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Background: It remains unclear whether the 22- and 25-gauge needles have equal diagnostic yields in endoscopic ultrasonography–fine needle aspiration of pancreatic masses. Methods: Patients presenting with pancreatic solid masses were prospectively included between July 2010 and June 2012. Each patient underwent ultrasonography–fine needle aspiration using two different needle sizes (22- and 25-gauge needles) during the same endoscopic session, the 25 and 22 needle sequence being randomized. Cytological preparations included smear cytology.....Read more
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