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Lack of typical histological findings for AP. Hematoxylin and Eosin staining of the EUS-FNB sample in high magnification showed that neutrophil infiltration and acinar-ductal metaplasia were the primary histological findings (A). Fat deposition was found in the pancreas, but there was no fat necrosis detected, which is a typical finding of AP (B). AP: acute pancreatitis, EUS: endoscopic ultrasonography, FNB: fine-needle biopsy
