{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T15:55:28Z","timestamp":1779206128285,"version":"3.51.4"},"reference-count":10,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,5,7]],"date-time":"2024-05-07T00:00:00Z","timestamp":1715040000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["DEN Open"],"published-print":{"date-parts":[[2025,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Immunoglobulin G4 (IgG4)\u2010related diseaseis a systemic inflammatory condition of unknown etiology characterized by increases in serum IgG4 and in the number of IgG4\u2010positive cells in affected tissues. One of the commonly involved locations is the pancreas; this condition is known as type 1 autoimmune pancreatitis (AIP). Type 1 AIP, which shows a biliary stricture in the intrapancreatic bile duct, can be misdiagnosed as a malignancy due to similar cholangiography findings and clinical presentation. In rare cases complicated by post\u2010bulbar duodenal ulcers, differentiating between type 1 AIP and malignancies is even more difficult. An 81\u2010year\u2010old male was referred to our hospital for the treatment of a pancreatic head mass and obstructive jaundice. Serological and radiological findings were consistent with both type 1 AIP and a malignancy. Gastroduodenoscopy revealed a post\u2010bulbar duodenal ulcer with endoscopic features that evoked malignant duodenal invasion. Although biopsies were negative for malignant cells, subsequent bleeding from the lesion suggested the progression of malignancy, which led to surgical resection. Pancreatoduodenectomy and pathological examination indicated that type 1 AIP was present. Simultaneously, the involvement of IgG4\u2010related disease in the ulcerative lesion was suggested. To our knowledge, this is the first reported case of type 1 AIP complicated by post\u2010bulbar duodenal ulcers, which was misdiagnosed as malignancy and considered an IgG4\u2010related gastrointestinal disease associated with type 1 AIP.<\/jats:p>","DOI":"10.1002\/deo2.384","type":"journal-article","created":{"date-parts":[[2024,5,7]],"date-time":"2024-05-07T09:48:52Z","timestamp":1715075332000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Immunoglobulin G4 \u2010related gastrointestinal disease associated with type 1 autoimmune pancreatitis: A case report"],"prefix":"10.1002","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-3132-0158","authenticated-orcid":false,"given":"Shingo","family":"Sato","sequence":"first","affiliation":[{"name":"Department of Gastroenterology Fukaya Red Cross Hospital  Saitama 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