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Based on her presentation, we kept a high index of suspicion for peritoneal carcinomatosis and malignancy. The patient underwent laparoscopic wedge resection of the gastric wall with biopsies of gastric wall and peritoneum. Both biopsies confirmed the diagnosis of metastatic invasive lobular breast carcinoma. Our case highlights the importance of diagnostic laparoscopy and EUS in the setting of negative EGD biopsy results with a high suspicion of breast cancer metastasis to gastric wall.<\/jats:p>","DOI":"10.1136\/bcr-2020-241467","type":"journal-article","created":{"date-parts":[[2021,5,12]],"date-time":"2021-05-12T13:14:45Z","timestamp":1620825285000},"page":"e241467","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Breast carcinoma metastasising to the gastric wall and the peritoneum: what physicians need to know"],"prefix":"10.1136","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1240-6441","authenticated-orcid":false,"given":"Abdullah","family":"Sohail","sequence":"first","affiliation":[{"name":"West Virginia University Robert C Byrd Health Sciences Center Charleston Division, Charleston, West Virginia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7743-7740","authenticated-orcid":false,"given":"Ahmad","family":"Khan","sequence":"additional","affiliation":[{"name":"West Virginia University Robert C Byrd Health Sciences Center Charleston Division, Charleston, West Virginia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander","family":"Gross","sequence":"additional","affiliation":[{"name":"Pathology Resident, West Virginia University\u2014Health Sciences Campus, Morgantown, West Virginia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hamza","family":"Shah","sequence":"additional","affiliation":[{"name":"Assistant Professor Gastroenterology, Charleston Area Medical Center, Charleston, West Virginia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,5,12]]},"reference":[{"key":"2025082711324338000_14.5.e241467.1","doi-asserted-by":"crossref","unstructured":"Siegel R , Naishadham D , Jemal A . 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