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However, an ECG performed at the GP clinic confirmed paroxysmal atrial fibrillation, and the patient also reported palpitations and shortness of breath at that time. Her Wells score for pulmonary embolism was 7.5, warranting urgent CT pulmonary angiography (CTPA) and initiation of therapeutic enoxaparin. CTPA demonstrated acute pulmonary vein thrombosis rather than pulmonary embolism. A multidisciplinary team discussion was held, and apixaban was commenced following haematology consultation. Follow-up CTPA confirmed complete resolution of the thrombus.<\/jats:p>","DOI":"10.1136\/bcr-2025-267795","type":"journal-article","created":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T04:05:19Z","timestamp":1766117119000},"page":"e267795","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Unmasking pulmonary vein thrombosis: a rare mimic of pulmonary embolism"],"prefix":"10.1136","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4252-8201","authenticated-orcid":false,"given":"Hasan H","family":"Alsararatee","sequence":"first","affiliation":[{"name":"Acute Medicine, Northampton General Hospital NHS Trust, Northampton, UK"},{"name":"Advanced Clinical Practice, Buckinghamshire New University, London, England, 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