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Biopsy and histopathological review of both pulmonary and gastric masses revealed two distinct sarcomatous malignancies that, while both from a primary lung source, differed in their morphology. Natural history and behaviour are not well understood in sarcomas due to their rarity, but abdominal metastasis is considered an uncommon event in the progression of the disease. Gastrointestinal bleeding as the presenting symptom of a primary lung sarcoma is an atypical finding with no previously reported cases.<\/jats:p>","DOI":"10.1136\/bcr-2021-242364","type":"journal-article","created":{"date-parts":[[2021,8,12]],"date-time":"2021-08-12T12:07:29Z","timestamp":1628770049000},"page":"e242364","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Primary lung sarcoma with gastric metastasis and morphological divergence presenting as melena"],"prefix":"10.1136","volume":"14","author":[{"given":"Michael J","family":"Eiswerth","sequence":"first","affiliation":[{"name":"Internal Medicine Residency, University of Louisville, Louisville, Kentucky, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander","family":"Pinter","sequence":"additional","affiliation":[{"name":"Internal Medicine Residency, University of Louisville, Louisville, Kentucky, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8652-183X","authenticated-orcid":false,"given":"Samuel Benjamin","family":"Reynolds","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, University of Louisville School of Medicine, Louisville, Kentucky, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Guardiola","sequence":"additional","affiliation":[{"name":"Gastroenterology and Hepatology, Indiana University, Indianapolis, Indiana, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,8,12]]},"reference":[{"key":"2025082712115556000_14.8.e242364.1","doi-asserted-by":"publisher","DOI":"10.1136\/thx.49.1.14"},{"key":"2025082712115556000_14.8.e242364.2","doi-asserted-by":"crossref","first-page":"176","DOI":"10.4103\/2278-0513.130221","article-title":"Primary sarcoma of the lung: a very rare diagnosis and poor prognosis","volume":"3","author":"Belbaraka","year":"2014","journal-title":"Clin Cancer Investig J"},{"key":"2025082712115556000_14.8.e242364.3","unstructured":"Bridge JA , Hogendoorn P , International Agency for Research on Cancer, World Health Organization(WHO), International Academy of Pathology . 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