{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T13:14:48Z","timestamp":1777727688143,"version":"3.51.4"},"reference-count":32,"publisher":"SAGE Publications","issue":"6","license":[{"start":{"date-parts":[[2024,6,1]],"date-time":"2024-06-01T00:00:00Z","timestamp":1717200000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100023320","name":"College of Medicine, Catholic University of Korea","doi-asserted-by":"publisher","award":["5-2023-B0001-00286"],"award-info":[{"award-number":["5-2023-B0001-00286"]}],"id":[{"id":"10.13039\/501100023320","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Int Med Res"],"published-print":{"date-parts":[[2024,6]]},"abstract":"<jats:p>Immunoglobulin G4-related disease (IgG4-RD) is a fibroinflammatory condition characterized by chronic activation of the immune system and a tendency to form tumorous lesions. IgG4-RD is frequently characterized by the presence of tumor-like masses affecting multiple organs and is easily mistaken for a malignant neoplasm. However, IgG4-RD affecting the appendix is extremely rare, with only seven cases reported previously. We report the case of a woman in her early 60s who presented with insidious abdominal pain and radiological findings mimicking appendiceal neoplasms. After diagnosing appendiceal neoplasms, surgery was performed. The patient had a serum IgG4 concentration of &lt;1.35\u2009g\/L, which did not satisfy one of the three revised comprehensive diagnostic criteria for IgG4-RD. A pathological examination was conducted, and the patient was diagnosed with appendiceal IgG4-RD. To the best of our knowledge, there have been no previously reported cases of IgG4-RD affecting the appendix in patients with low serum IgG4 concentrations. This report may prove beneficial for the future understanding of IgG4-RD and for the revision of diagnostic and treatment strategies.<\/jats:p>","DOI":"10.1177\/03000605241260540","type":"journal-article","created":{"date-parts":[[2024,6,20]],"date-time":"2024-06-20T22:22:24Z","timestamp":1718922144000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Immunoglobulin G4-related disease mimicking an appendiceal neoplasm: a case report"],"prefix":"10.1177","volume":"52","author":[{"given":"Dongwoo","family":"Kim","sequence":"first","affiliation":[{"name":"College of Medicine, The Catholic University of Korea, Seoul, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jongwon","family":"Lee","sequence":"additional","affiliation":[{"name":"College of Medicine, The Catholic University of Korea, Seoul, 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