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A bone marrow core biopsy revealed an increase in reticulin fibre and increase in the number of blasts of 5%\u201310%, whereas peripheral blood testing was positive for JAK2 V617F mutation. This case report reviews the literature for cases of extramedullary haematopoiesis associated with myeloproliferative neoplasms.<\/jats:p>","DOI":"10.1136\/bcr-2017-221316","type":"journal-article","created":{"date-parts":[[2017,8,10]],"date-time":"2017-08-10T04:40:32Z","timestamp":1502340032000},"page":"bcr-2017-221316","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Extramedullary haematopoiesis presenting with cardiac tamponade in a patient with polycythaemia vera"],"prefix":"10.1136","volume":"2017","author":[{"given":"Faysal","family":"Haroun","sequence":"first","affiliation":[{"name":"Division of Hematology and Oncology, Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Viktoria","family":"Elkis","sequence":"additional","affiliation":[{"name":"Department of Medicine, George Washington University School of Medicine and Health Sciences, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Pathology, The George Washington University School of Medicine and Health Sciences, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elsie","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Pathology, The George Washington University School of Medicine and Health Sciences, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2017,8,10]]},"reference":[{"key":"2025082707064226000_2017.aug10_1.bcr-2017-221316.1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2016-01-643569"},{"key":"2025082707064226000_2017.aug10_1.bcr-2017-221316.2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2010.599"},{"key":"2025082707064226000_2017.aug10_1.bcr-2017-221316.3","unstructured":"Goldman L, I , Schafer A . 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