{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T01:54:20Z","timestamp":1776650060360,"version":"3.51.2"},"reference-count":21,"publisher":"BMJ","issue":"3","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2021,3,8]]},"published-print":{"date-parts":[[2021,3]]},"abstract":"<jats:p>Fever of unknown origin (FUO) has a broad differential diagnosis, including infectious, inflammatory and malignant aetiologies. Granulomatosis with polyangiitis (GPA) can present with non-specific symptoms, including fever, lethargy and flu-like illness. While systemic vasculitis causing FUO has been well-documented, GPA as an underlying cause for FUO poses a diagnostic and therapeutic challenge for clinicians. We present the case of a 65-year-old man who presented to the emergency department with a report of fever, myalgia and night sweats for greater than 3 weeks. After an extensive workup, the patient was diagnosed with GPA and he eventually responded to corticosteroids and immunosuppressive therapy. This case aims to raise awareness of FUO secondary to GPA and serves as a reminder to clinicians that early recognition and prompt treatment of this syndrome improves patient outcomes.<\/jats:p>","DOI":"10.1136\/bcr-2020-239713","type":"journal-article","created":{"date-parts":[[2021,3,26]],"date-time":"2021-03-26T13:41:39Z","timestamp":1616766099000},"page":"e239713","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Granulomatosis with polyangiitis manifesting as fever of unknown origin"],"prefix":"10.1136","volume":"14","author":[{"given":"Faisal","family":"Mahfooz","sequence":"first","affiliation":[{"name":"Internal Medicine, Parkview Medical Center, Pueblo, Colorado, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7491-8477","authenticated-orcid":false,"given":"Douglas","family":"Duffee","sequence":"additional","affiliation":[{"name":"Internal Medicine, Parkview Medical Center, Pueblo, Colorado, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rupal","family":"Chavda","sequence":"additional","affiliation":[{"name":"Rheumatology, Parkview Medical Center, Pueblo, Colorado, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,3,26]]},"reference":[{"key":"2025082701134947000_14.3.e239713.1","doi-asserted-by":"publisher","DOI":"10.1097\/00005792-196102000-00001"},{"key":"2025082701134947000_14.3.e239713.2","doi-asserted-by":"crossref","first-page":"796","DOI":"10.1007\/s00508-016-1083-9","article-title":"Fever of unknown origin (FUO) revised","volume":"128","author":"Unger","year":"2016","journal-title":"Wien Klin Wochenschr"},{"key":"2025082701134947000_14.3.e239713.3","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2796.2003.01120.x"},{"key":"2025082701134947000_14.3.e239713.4","first-page":"91","article-title":"Prolonged febrile illness and fever of unknown origin in adults","volume":"90","author":"Hersch","year":"2014","journal-title":"Am Fam Physician"},{"key":"2025082701134947000_14.3.e239713.5","doi-asserted-by":"publisher","DOI":"10.1001\/archinte.163.5.545"},{"key":"2025082701134947000_14.3.e239713.6","doi-asserted-by":"crossref","DOI":"10.1186\/s12879-019-4285-8","article-title":"Fever of unknown origin (FUO): which are the factors influencing the final diagnosis? A 2005-2015 systematic review","volume":"19","author":"Fusco","year":"2019","journal-title":"BMC Infect Dis"},{"key":"2025082701134947000_14.3.e239713.7","doi-asserted-by":"crossref","first-page":"21","DOI":"10.2298\/VSP140820128P","article-title":"Fever of unknown origin: most frequent causes in adults patients","volume":"73","author":"Popovska-Jovici\u0107","year":"2016","journal-title":"Vojnosanit Pregl"},{"key":"2025082701134947000_14.3.e239713.8","first-page":"5862","article-title":"Fever of unknown origin: report of 107 cases in a university hospital","volume":"7","author":"Yu","year":"2014","journal-title":"Int J Clin Exp Med"},{"key":"2025082701134947000_14.3.e239713.9","unstructured":"Brown I , Finnigan NA . Fever of Unknown Origin (FUO). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing, 2020. https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK532265\/"},{"key":"2025082701134947000_14.3.e239713.10","unstructured":"Garlapati P , Qurie A . 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