{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T01:35:59Z","timestamp":1780450559074,"version":"3.54.1"},"reference-count":15,"publisher":"BMJ","issue":"8","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2023,8,22]]},"published-print":{"date-parts":[[2023,8]]},"abstract":"<jats:p>A man in his early 70s presented with stiffness and aching in the shoulder and pelvic girdles. His C reactive protein level was elevated at 116\u2009mg\/L, leading to an initial diagnosis of polymyalgia rheumatica. Treatment with prednisone at 20\u2009mg\/day provided limited improvement and relapses recurred despite concomitant immunosuppressive agents. Extensive investigations failed to reveal an underlying aetiology.<\/jats:p>\n               <jats:p>Five years later, gross painless haematuria led to the detection of an invasive papillary urothelial carcinoma. A review of the staging CT scan revealed findings compatible with bilateral erosive sacroiliitis, which had developed since his initial presentation. Radical cystoprostatectomy provided temporary relief but after a further 9 months, symptoms relapsed, and metastatic spread was discovered.<\/jats:p>\n               <jats:p>Paraneoplastic sacroiliitis is a rare clinical entity; and to the best of our knowledge, this is the first reported case associated with a solid tumour.<\/jats:p>","DOI":"10.1136\/bcr-2022-252572","type":"journal-article","created":{"date-parts":[[2023,8,31]],"date-time":"2023-08-31T11:55:43Z","timestamp":1693482943000},"page":"e252572","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Paraneoplastic sacroiliitis"],"prefix":"10.1136","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2881-7739","authenticated-orcid":false,"given":"Uri","family":"Arad","sequence":"first","affiliation":[{"name":"Rheumatology, Waikato Hospital, Hamilton, New Zealand"},{"name":"Waikato Clinical School, University of Auckland, Hamilton, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charles","family":"Werren","sequence":"additional","affiliation":[{"name":"Radiology, Waikato Hospital, Hamilton, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Douglas","family":"White","sequence":"additional","affiliation":[{"name":"Rheumatology, Waikato Hospital, Hamilton, New Zealand"},{"name":"Waikato Clinical School, University of Auckland, Hamilton, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2023,8,31]]},"reference":[{"key":"2025082709235542000_16.8.e252572.1","doi-asserted-by":"crossref","first-page":"658538","DOI":"10.3389\/fmed.2021.658538","article-title":"Axial spondyloarthritis: mimics and pitfalls of imaging assessment","volume":"8","author":"Caetano","year":"2021","journal-title":"Front Med"},{"key":"2025082709235542000_16.8.e252572.2","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1179\/acb.2010.041","article-title":"Sacroiliitis as an initial presentation of acute lymphoblastic leukaemia","volume":"65","author":"Moghadam","year":"2010","journal-title":"Acta Clin Belg"},{"key":"2025082709235542000_16.8.e252572.3","first-page":"151","article-title":"A Prodrome of acute lymphoblastic leukemia","volume":"8","author":"Esen","year":"2011","journal-title":"Eur J Gen Med"},{"key":"2025082709235542000_16.8.e252572.4","doi-asserted-by":"crossref","first-page":"1143","DOI":"10.3892\/ol.2015.4026","article-title":"Acute lymphocytic leukemia mimicking spondyloarthritis in an adolescent: a case report and review of the literature","volume":"11","author":"Xu","year":"2016","journal-title":"Oncol Lett"},{"key":"2025082709235542000_16.8.e252572.5","doi-asserted-by":"crossref","first-page":"434","DOI":"10.4103\/2249-4863.220014","article-title":"Low backache in adults as an initial presentation of acute lymphoblastic leukemia","volume":"6","author":"Garg","year":"2017","journal-title":"J Family Med Prim Care"},{"issue":"Suppl 2","key":"2025082709235542000_16.8.e252572.6","first-page":"71","article-title":"Sacroilitis paraneopl\u00e1sica: presentaci\u00f3n inusual de leucemia linfobl\u00e1stica aguda","volume":"88","author":"Sol\u00eds","year":"2020","journal-title":"Cir Cir"},{"key":"2025082709235542000_16.8.e252572.7","doi-asserted-by":"publisher","DOI":"10.1532\/IJH97.06106"},{"key":"2025082709235542000_16.8.e252572.8","doi-asserted-by":"crossref","first-page":"341","DOI":"10.14740\/jmc2540e","article-title":"A foe incognito: paraneoplastic sacroilitis","volume":"7","author":"Mondal","year":"2016","journal-title":"J Med Cases"},{"key":"2025082709235542000_16.8.e252572.9","doi-asserted-by":"crossref","first-page":"373","DOI":"10.3109\/14397595.2015.1097001","article-title":"A case of chronic myelomonocytic leukemia complicated with spondyloarthritis","volume":"28","author":"Matsumoto","year":"2018","journal-title":"Mod Rheumatol"},{"key":"2025082709235542000_16.8.e252572.10","doi-asserted-by":"crossref","first-page":"4357","DOI":"10.1007\/s10067-021-05714-7","article-title":"An elusive mimic of sacroiliitis: diagnostic dilemma for the rheumatologist","volume":"40","author":"Ciaffi","year":"2021","journal-title":"Clin Rheumatol"},{"key":"2025082709235542000_16.8.e252572.11","doi-asserted-by":"crossref","unstructured":"Watson GA , O\u2019Neill L , Law R , et al . 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