naa a22 4500 51081395X CHVBK 20180411083456.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12328-013-0392-z doi (NATIONALLICENCE)springer-10.1007/s12328-013-0392-z A case of focal autoimmune pancreatitis (AIP) mimicking an intraductal papillary mucinous neoplasm (IPMN) [Elektronische Daten] [So Nakaji, Nobuto Hirata, Hiroyuki Fujii, Kosuke Iwaki, Toshiyasu Shiratori, Masayoshi Kobayashi, Satoshi Wakasugi, Eiji Ishii, Hiroyuki Takeyama, Kazuei Hoshi] The present case involved a 76-year-old man with a cystic mass in the head of his pancreas. The cystic lesion, which measured 17.7×9.8mm, was first detected by ultrasonography (US) at the age of 72 years. Follow-up endoscopic ultrasonography (EUS) performed at 4years after the lesion had first been detected revealed a mural nodule measuring 14.0×8.4mm in the cyst. Endoscopic retrograde pancreatography (ERP) imaging revealed that the main pancreatic duct was in communication with the cyst and that there was no irregular narrowing of the main pancreatic duct. On the basis of these results, the patient was diagnosed with an intraductal papillary mucinous neoplasm (IPMN), and stomach-preserving pancreaticoduodenectomy was performed. A histopathological examination revealed that the interior of the cystic part of the lesion was lined by a pancreatic ductal epithelium. A pathological examination of the nodular lesion detected storiform fibrosis, severe lymphoplasmacytic infiltration, and hyperplasia in the pancreatic duct epithelium together with a small amount of mucus. On immunohistological staining, the infiltrating lymphoplasmacytes were found to be positive for IgG4. Accordingly, the patient was diagnosed with focal autoimmune pancreatitis (AIP). In conclusion, we reported a case of focal AIP mimicking IPMN. This case showed neither enlargement of the pancreas nor irregular narrowing of the main pancreatic duct. Springer Japan, 2013 Autoimmune pancreatitis nationallicence Pancreatic cyst nationallicence Intraductal papillary mucinous neoplasm nationallicence Nakaji So Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Hirata Nobuto Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Fujii Hiroyuki Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Iwaki Kosuke Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Shiratori Toshiyasu Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Kobayashi Masayoshi Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Wakasugi Satoshi Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Ishii Eiji Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut Takeyama Hiroyuki Department of Anatomic Pathology, Kameda Medical Center, Kamogawa, Japan aut Hoshi Kazuei Department of Anatomic Pathology, Kameda Medical Center, Kamogawa, Japan aut Clinical Journal of Gastroenterology Springer Japan 6/4(2013-08-01), 329-333 1865-7257 6:4<329 2013 6 12328 https://doi.org/10.1007/s12328-013-0392-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12328-013-0392-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nakaji So Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Hirata Nobuto Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Fujii Hiroyuki Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Iwaki Kosuke Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Shiratori Toshiyasu Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Kobayashi Masayoshi Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Wakasugi Satoshi Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Ishii Eiji Department of Gastroenterology, Kameda Medical Center, 929 Higashi-cho, Kamogawa, Chiba, Japan aut NATIONALLICENCE 700 1- Takeyama Hiroyuki Department of Anatomic Pathology, Kameda Medical Center, Kamogawa, Japan aut NATIONALLICENCE 700 1- Hoshi Kazuei Department of Anatomic Pathology, Kameda Medical Center, Kamogawa, Japan aut NATIONALLICENCE 773 0- Clinical Journal of Gastroenterology Springer Japan 6/4(2013-08-01), 329-333 1865-7257 6:4<329 2013 6 12328 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer