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A solitary polypoid mass present immediately rostral to the lower esophageal sphincter was biopsied during percutaneous endoscopic gastrostomy tube placement. Barrett esophagus was diagnosed based on the observation of a polypoid mass with intestinal metaplasia that arose from the surrounding esophagus. Histology of the polypoid mass demonstrated squamous-to-columnar metaplasia, hyperplasia, dysplasia, and carcinoma in situ.<\/jats:p>","DOI":"10.1177\/1040638718786330","type":"journal-article","created":{"date-parts":[[2018,6,28]],"date-time":"2018-06-28T08:31:41Z","timestamp":1530174701000},"page":"752-754","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Carcinoma in situ within an area of Barrett esophagus in a dog with megaesophagus"],"prefix":"10.1177","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1712-9615","authenticated-orcid":false,"given":"Matthew A.","family":"Kopke","sequence":"first","affiliation":[{"name":"School of Veterinary Science, Massey University, Palmerston North, New Zealand."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John S.","family":"Munday","sequence":"additional","affiliation":[{"name":"School of Veterinary Science, Massey University, Palmerston North, New Zealand."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6449-2812","authenticated-orcid":false,"given":"Arnon","family":"Gal","sequence":"additional","affiliation":[{"name":"School of Veterinary Science, Massey University, Palmerston North, New Zealand."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2018,6,28]]},"reference":[{"key":"bibr1-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1111\/j.1572-0241.2008.02004.x"},{"key":"bibr2-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/j.jss.2006.04.023"},{"key":"bibr3-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/0016-5085(95)90642-8"},{"key":"bibr4-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1293\/tox.2017-0009"},{"key":"bibr5-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1177\/0300985809352973"},{"key":"bibr6-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1002\/bjs.1800750208"},{"key":"bibr7-1040638718786330","doi-asserted-by":"publisher","DOI":"10.5326\/0420065"},{"key":"bibr8-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/S1566-0702(02)00054-1"},{"key":"bibr9-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1007\/BF02090355"},{"key":"bibr10-1040638718786330","first-page":"267","volume":"34","author":"Jankowski M","year":"2014","journal-title":"Pak Vet J"},{"key":"bibr11-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1111\/cts.12304"},{"key":"bibr12-1040638718786330","first-page":"E1","volume":"34","author":"Mace S","year":"2012","journal-title":"Compend Contin Educ Vet"},{"key":"bibr13-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/j.gassur.2005.08.033"},{"key":"bibr14-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/j.suc.2015.02.006"},{"key":"bibr15-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1111\/jsap.12333"},{"key":"bibr16-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1111\/j.1572-0241.2008.01835.x"},{"key":"bibr17-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1016\/S0195-5616(03)00076-7"},{"key":"bibr18-1040638718786330","doi-asserted-by":"publisher","DOI":"10.1111\/j.1748-5827.1995.tb02858.x"}],"container-title":["Journal of Veterinary Diagnostic Investigation"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1040638718786330","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/1040638718786330","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1040638718786330","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T00:21:47Z","timestamp":1777681307000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/1040638718786330"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,6,28]]},"references-count":18,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2018,9]]}},"alternative-id":["10.1177\/1040638718786330"],"URL":"https:\/\/doi.org\/10.1177\/1040638718786330","relation":{},"ISSN":["1040-6387","1943-4936"],"issn-type":[{"value":"1040-6387","type":"print"},{"value":"1943-4936","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,6,28]]}}}