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The patient underwent surgical repair of the artery and intraoperative biopsies confirmed a diagnosis of synovial sarcoma. This case highlights the importance of maintaining suspicion for soft-tissue sarcomas in young patients presenting with a mass, and demonstrates the way in which these tumours may mimic other pathologies both clinically and radiologically. Early referral to a specialist sarcoma centre is key for further investigative workup.<\/jats:p>","DOI":"10.1136\/bcr-2019-232135","type":"journal-article","created":{"date-parts":[[2019,11,27]],"date-time":"2019-11-27T05:15:19Z","timestamp":1574831719000},"page":"e232135","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Synovial sarcoma mimicking a traumatic pseudoaneurysm in the upper extremity"],"prefix":"10.1136","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7355-7542","authenticated-orcid":false,"given":"Judy","family":"Wang","sequence":"first","affiliation":[{"name":"Vascular Surgery, Northern Hospital, Epping, Victoria, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong Kuan","family":"Kok","sequence":"additional","affiliation":[{"name":"Radiology, Northern Hospital, Epping, Victoria, 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