{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T14:03:40Z","timestamp":1784037820326,"version":"3.55.0"},"reference-count":6,"publisher":"BMJ","issue":"7","license":[{"start":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T00:00:00Z","timestamp":1783987200000},"content-version":"unspecified","delay-in-days":13,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2026,6,18]]},"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:p>Lipoma arborescens is a rare intra-articular lesion typically associated with chronic monoarthritis. We report on a man in his 40s with psoriatic arthritis, well controlled with secukinumab, who developed chronic bilateral knee effusion and soft, non-tender suprapatellar masses over several years despite low systemic disease activity. Magnetic resonance (MR) imaging revealed frond-like fatty proliferation with effusion, which was confirmed as lipoma arborescens on histopathology. Bilateral synovectomy restored full knee extension and improved mobility and function. MR imaging is an excellent non-invasive tool to diagnose persistent knee swelling, guide management and prevent long-term complications.<\/jats:p>","DOI":"10.1136\/bcr-2026-273150","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T13:05:27Z","timestamp":1784034327000},"page":"e273150","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Bilateral knee lipoma arborescens mimicking persistent inflammatory arthritis in a patient with psoriatic arthritis"],"prefix":"10.1136","volume":"19","author":[{"given":"Beatrice April Austria","family":"Layog","sequence":"first","affiliation":[{"name":"Division of Rheumatology, Department of Medicine, University of the Philippines-Philippine General Hospital, Manila, Philippines"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan Raphael","family":"Gonzales","sequence":"additional","affiliation":[{"name":"Division of Rheumatology, Department of Medicine, University of the Philippines-Philippine General Hospital, Manila, Philippines"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John Ricardo","family":"Chua","sequence":"additional","affiliation":[{"name":"Department of Orthopedics, University of the Philippines-Philippine General Hospital, Manila, Philippines"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donnel Alexis","family":"Rubio","sequence":"additional","affiliation":[{"name":"Department of Orthopedics, University of the Philippines-Philippine General Hospital, Manila, Philippines"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,7,14]]},"reference":[{"key":"2026071406052047000_19.7.e273150.1","first-page":"100163","article-title":"Lipoma arborescens of the knee - A case report","volume":"2","author":"Kamath K","year":"2023","journal-title":"J Orthop Rep"},{"key":"2026071406052047000_19.7.e273150.2","unstructured":"Firestein GS , Budd RC , Gabriel SE , et al , eds. Firestein & Kelley\u2019s textbook of rheumatology. 12th edn. 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