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The mass originated in the aortopulmonary window of the left mediastinum and invaded proximally into the left superior pulmonary vein and subsequently into the left atrium. The mass protrusion into the mitral valve occupied 50% of the left atrium space but showed no clinical symptoms of a valvular blockade. Poorly differentiated squamous cell carcinoma was identified upon biopsy. These findings of a primary lung tumor with atrial extension in an asymptomatic patient point to the importance of age-appropriate screening and standardization treatment modalities.<\/jats:p>","DOI":"10.1155\/2021\/4256471","type":"journal-article","created":{"date-parts":[[2021,12,22]],"date-time":"2021-12-22T03:05:12Z","timestamp":1640142312000},"page":"1-5","source":"Crossref","is-referenced-by-count":1,"title":["Asymptomatic Tumor Thrombus in the Left Atrium from Squamous Cell Carcinoma"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6649-5419","authenticated-orcid":true,"given":"Nick","family":"Huang","sequence":"first","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christina","family":"DiCorato","sequence":"additional","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Basel","family":"Abuzuaiter","sequence":"additional","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3673-5626","authenticated-orcid":true,"given":"Adriana","family":"May","sequence":"additional","affiliation":[{"name":"Department of Pathology, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Swati P.","family":"Deshmane","sequence":"additional","affiliation":[{"name":"Department of Radiology, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debanik","family":"Chaudhuri","sequence":"additional","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephen","family":"Graziano","sequence":"additional","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"},{"name":"Department of Hematology and Oncology, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Harvir Singh","family":"Gambhir","sequence":"additional","affiliation":[{"name":"Department of Medicine, SUNY Upstate Medical University, Syracuse, NY, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1007\/s12410-014-9281-1"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1093\/ejechocard\/jeq045"},{"key":"3","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8191.2009.00927.x"},{"key":"4","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa1809697"},{"key":"5","doi-asserted-by":"publisher","DOI":"10.21037\/cdt.2017.09.16"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.3322\/caac.21387"},{"key":"7","doi-asserted-by":"publisher","DOI":"10.1177\/0218492313515896"},{"key":"8","doi-asserted-by":"publisher","DOI":"10.1016\/s0894-7317(05)80019-7"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1016\/s1053-0770(97)90063-x"},{"key":"10","doi-asserted-by":"publisher","DOI":"10.1155\/2016\/7084234"},{"key":"11","doi-asserted-by":"publisher","DOI":"10.1016\/j.lungcan.2007.02.001"},{"key":"12","first-page":"195","article-title":"The incidence of secondary tumors of the heart and pericardium: a 10-year study","volume":"18","author":"K. 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