{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,15]],"date-time":"2026-08-15T04:58:58Z","timestamp":1786769938514,"version":"build-2736575974"},"reference-count":11,"publisher":"BMJ","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Reports"],"accepted":{"date-parts":[[2017,1,23]]},"abstract":"<jats:p>Extramedullary plasmacytomas (EP) are tumours composed by a monoclonal population of plasma cells that arise in extraosseus tissues, comprising &lt;5% of all plasma cell neoplasms. Usually, EP arise in the head and neck region, and the stomach is the second most common location\u2014gastric plasmacytoma (GP). Clinical and radiological manifestations are unspecific and may mimic other tumours like gastric adenocarcinomas, gastric stromal tumours and lymphomas, mainly marginal cell lymphoma (MALT lymphoma) and usually definitive diagnosis is provided by pathological evaluation. We present a case of primary GP, discovered incidentally as a polypoid lesion. Tumour was composed by sheets of mature and immature plasmocytes positive for CD138 on immunohistochemistry, without<jats:italic>Helicobacter pylori<\/jats:italic>identification. The patient is alive 6\u2005years later and without tumour relapse.<\/jats:p>","DOI":"10.1136\/bcr-2016-218967","type":"journal-article","created":{"date-parts":[[2017,2,6]],"date-time":"2017-02-06T15:55:23Z","timestamp":1486396523000},"page":"bcr2016218967","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":8,"title":["Primary gastric plasmacytoma: a rare entity"],"prefix":"10.1136","volume":"2017","author":[{"given":"Rui Caetano","family":"Oliveira","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro","family":"Amaro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria Jos\u00e9","family":"Juli\u00e3o","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria Augusta","family":"Cipriano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2017,2,6]]},"reference":[{"key":"2025042705194778000_2017.feb06_1.bcr2016218967.1","doi-asserted-by":"publisher","DOI":"10.1182\/blood-2016-01-643569"},{"key":"2025042705194778000_2017.feb06_1.bcr2016218967.2","unstructured":"Jaffe ES , Harris NL , Vardiman JW , et al . 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