{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T06:03:12Z","timestamp":1778565792418,"version":"3.51.4"},"reference-count":13,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T00:00:00Z","timestamp":1721865600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T00:00:00Z","timestamp":1721865600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["BMC Musculoskelet Disord"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>Synovial hemangiomas are rare benign vascular anomalies surrounded by a synovial lining and were first described by Bouchut in 1856. These neoplasms can develop in the intra-articular region, resulting in effusions and knee pain. However, their cause remains unknown. Prompt diagnosis and intervention are critical to prevent chondral damage. Histopathological examination is used to achieve the diagnosis, which is often delayed because of a lack of specific clinical signs. This report describes a unique case in which a painful infrapatellar mass was diagnosed as a synovial hemangioma. The absence of typical magnetic resonance imaging (MRI) findings highlights the importance of arthroscopic excision for diagnosis and symptom relief.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Case presentation<\/jats:title>\n                <jats:p>A 20-year-old woman presented with persistent anterior left knee pain that became exacerbated when she climbed stairs. Despite previous pain management and physical therapy, she developed a painful lump beneath her patella that worsened over time. She had also undergone arthrocentesis, but this did not relieve her pain. Physical examination revealed a palpable, immobile 5-cm mass along the patellar tendon with limited knee flexion and extension and normal ligament stability. T1-weighted fat-saturated MRI of the left knee with gadolinium-based contrast revealed a lobulated intra-articular mass in Hoffa\u2019s fat pad that resembled a soft tissue chondroma. A biopsy of the mass was performed to provide histopathological evidence, confirming the benign nature of the mass. The subsequent excisional arthroscopy, combined with incision enlargement for mass removal, confirmed the histopathologic diagnosis of synovial hemangioma based on the presence of numerous dilated blood vessels and venous proliferation within sections of the synovium. Recovery was complete, and no residual tumor was detected on follow-up MRI after 1 year.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>This case study emphasizes the importance of arthroscopic excision over open surgery for patients with synovial hemangioma. The minimally invasive nature of arthroscopy combined with the well-encapsulated nature and location of the mass facilitates complete resection.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12891-024-07708-3","type":"journal-article","created":{"date-parts":[[2024,7,25]],"date-time":"2024-07-25T07:02:28Z","timestamp":1721890948000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Synovial hemangioma presenting with chronic painful infrapatellar mass: a case report"],"prefix":"10.1186","volume":"25","author":[{"given":"Wasaphon","family":"Suphakitchanusan","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Napatr","family":"Wongboonkuakul","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kancharos","family":"Trakulsujaritchok","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chomkwan","family":"Decha-umphai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thanapon","family":"Chobpenthai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,7,25]]},"reference":[{"key":"7708_CR1","doi-asserted-by":"publisher","first-page":"597","DOI":"10.1055\/s-0042-1743223","volume":"35","author":"RL Auran","year":"2022","unstructured":"Auran RL, Martin JR, Duran MD, de Comas AM, Jacofsky DJ. Evaluation and management of intra-articular tumors of the knee. J Knee Surg. 2022;35:597\u2013606. https:\/\/doi.org\/10.1055\/s-0042-1743223.","journal-title":"J Knee Surg"},{"key":"7708_CR2","doi-asserted-by":"publisher","first-page":"291","DOI":"10.4103\/jdmimsu.jdmimsu_29_23","volume":"18","author":"AR Kolluru","year":"2023","unstructured":"Kolluru AR, Gautam AA, Garg S, Tamboli AI. Magnetic resonance imaging of synovial diseases of knee. J Datta Meghe Inst Med Sci Univ. 2023;18:291\u20138. https:\/\/doi.org\/10.4103\/jdmimsu.jdmimsu_29_23.","journal-title":"J Datta Meghe Inst Med Sci Univ"},{"key":"7708_CR3","doi-asserted-by":"publisher","first-page":"109352","DOI":"10.1016\/j.ijscr.2024.109352","volume":"116","author":"R Uemura","year":"2024","unstructured":"Uemura R, Kumagai K, Kubo M, Mimura T, Yayama T, Imai S. Knee joint synovial hemangioma treated with arthroscopic resection without hemarthrosis: a case report. 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J Pediatr. 2016;172:222\u20133. https:\/\/doi.org\/10.1016\/j.jpeds.2016.01.052.","journal-title":"J Pediatr"},{"key":"7708_CR12","doi-asserted-by":"publisher","first-page":"767","DOI":"10.1016\/j.diii.2016.06.004","volume":"97","author":"A Larbi","year":"2016","unstructured":"Larbi A, Viala P, Cyteval C, Snene F, Greffier J, Faruch M, et al. Imaging of tumors and tumor-like lesions of the knee. Diagn Interv Imaging. 2016;97:767\u201377. https:\/\/doi.org\/10.1016\/j.diii.2016.06.004.","journal-title":"Diagn Interv Imaging"},{"key":"7708_CR13","doi-asserted-by":"publisher","first-page":"974","DOI":"10.1007\/s12262-020-02566-4","volume":"83","author":"W Li","year":"2021","unstructured":"Li W, Yu F, Wu X, Jiang CQ, You T, Zhong QW, et al. Extra-articular arthroscopic excision of the intramuscular hemangioma in a lower extremity has better therapeutic effect and higher satisfaction with appearance comparing with open excision. 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