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There have been few cases in the literature of HCL presenting as lymphomas in extra-nodal locations, such as soft tissues and bones without circulating leukemic cells, splenomegaly, or iliac crest bone marrow involvement. We present an additional case presenting as a thoracic mass, and discuss potential diagnostic pitfalls and management of these rare cases.<\/jats:p>","DOI":"10.4081\/rt.2017.6518","type":"journal-article","created":{"date-parts":[[2017,3,31]],"date-time":"2017-03-31T03:27:45Z","timestamp":1490930865000},"page":"1-3","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Hairy Cell Lymphoma: A Potentially Under-Recognized Entity"],"prefix":"10.1177","volume":"9","author":[{"given":"William A.","family":"Hammond","sequence":"first","affiliation":[{"name":"Division of Hematology\/Oncology, Mayo Clinic, Jacksonville, FL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abhisek","family":"Swaika","sequence":"additional","affiliation":[{"name":"Division of Hematology\/Oncology, Mayo Clinic, Jacksonville, FL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Menke","sequence":"additional","affiliation":[{"name":"Division of Laboratory Medicine and Pathology, Mayo Clinic, Jacksonville, FL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Han W.","family":"Tun","sequence":"additional","affiliation":[{"name":"Division of Hematology\/Oncology, Mayo Clinic, Jacksonville, FL, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2016,3,1]]},"reference":[{"key":"bibr1-rt.2017.6518","volume-title":"WHO classification of tumours of haematopoietic and lymphoid tissues","author":"Swerdlow S","year":"2008","edition":"4"},{"key":"bibr2-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1182\/blood.V92.6.1918"},{"key":"bibr3-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1014209"},{"key":"bibr4-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1016\/S1521-6926(02)00086-5"},{"key":"bibr5-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2011-09-379339"},{"key":"bibr6-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.3109\/10428194.2011.565395"},{"key":"bibr7-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1007\/BF00351002"},{"key":"bibr8-rt.2017.6518","first-page":"497027","volume":"2014","author":"Pilichowska M","year":"2014","journal-title":"Case Rep Pathol"},{"key":"bibr9-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1200\/JCO.2012.44.8787"},{"key":"bibr10-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1016\/S1521-6926(02)00085-3"},{"key":"bibr11-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1136\/pgmj.59.687.40"},{"key":"bibr12-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1111\/bjh.12420"},{"key":"bibr13-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1111\/his.12694"},{"key":"bibr14-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1080\/1042819021000016122"},{"key":"bibr15-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1007\/s12308-014-0221-4"},{"key":"bibr16-rt.2017.6518","first-page":"803921","volume":"2015","author":"Yonal-Hindilerden I","year":"2015","journal-title":"Case Rep Hematol"},{"key":"bibr17-rt.2017.6518","first-page":"1","author":"Fan L","year":"2015","journal-title":"Leuk Lymphoma"},{"key":"bibr18-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1007\/s12253-014-9807-5"},{"key":"bibr19-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1111\/bjh.12735"},{"key":"bibr20-rt.2017.6518","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1506583"}],"container-title":["Rare Tumors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.4081\/rt.2017.6518","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.4081\/rt.2017.6518","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.4081\/rt.2017.6518","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T05:36:35Z","timestamp":1777613795000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.4081\/rt.2017.6518"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,3,1]]},"references-count":20,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2017,3,30]]}},"alternative-id":["10.4081\/rt.2017.6518"],"URL":"https:\/\/doi.org\/10.4081\/rt.2017.6518","relation":{},"ISSN":["2036-3613","2036-3613"],"issn-type":[{"value":"2036-3613","type":"print"},{"value":"2036-3613","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,3,1]]}}}