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In contrast, ductal carcinoma in situ (DCIS) is a noninvasive, nonobligate precursor to invasive mammary carcinoma, confined within the terminal duct lobular unit of the breast and surrounded by an intact myoepithelial cell layer at the stromal\/epithelial interface. We present an unusual case in which a patient with only DCIS of the breast exhibited papillary carcinoma within a sentinel lymph node, leading to questions about the origin of the lymph node lesion\u2014whether it represents a true metastasis or iatrogenic displacement during diagnostic procedures. This case underscores the diagnostic challenges and clinical implications associated with such rare presentations.<\/jats:p>","DOI":"10.1177\/10668969241235316","type":"journal-article","created":{"date-parts":[[2024,3,19]],"date-time":"2024-03-19T02:20:04Z","timestamp":1710814804000},"page":"1588-1594","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Rare Presentation of Papillary Carcinoma Within a Sentinel Lymph Node in a Patient With Ductal Carcinoma in Situ of the Breast: A Challenging but Useful Case Report Discussion Regarding Displacement or True Metastasis?"],"prefix":"10.1177","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-2991-9333","authenticated-orcid":false,"given":"Fnu","family":"Sonam","sequence":"first","affiliation":[{"name":"Mayo Clinic Research in Florida"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miglena K.","family":"Komforti","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine and Pathology, Mayo Clinic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8005-1072","authenticated-orcid":false,"given":"James W.","family":"Jakub","sequence":"additional","affiliation":[{"name":"Department of Oncology, Mayo Clinic in Florida Radiation, Jacksonville, FL, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren F.","family":"Cornell","sequence":"additional","affiliation":[{"name":"Mayo Clinic Breast Diagnostic Clinic, Jacksonville, FL, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5520-2430","authenticated-orcid":false,"given":"Kristin A.","family":"Robinson","sequence":"additional","affiliation":[{"name":"Department of Radiology, Mayo Clinic, Jacksonville, FL, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2024,3,18]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1470-2045(10)70207-2"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1001\/archsurg.139.6.634"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1097\/00000478-200412000-00014"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1524-4741.2000.20002.x"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0b013e31815c6c9d"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1055\/b-0034-67323"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1309\/7EF8-F1W7-YVNT-H8H5"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa0904832"}],"container-title":["International Journal of Surgical Pathology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/10668969241235316","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/10668969241235316","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/10668969241235316","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T08:12:21Z","timestamp":1787645541000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/10668969241235316"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,18]]},"references-count":8,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2024,12]]}},"alternative-id":["10.1177\/10668969241235316"],"URL":"https:\/\/doi.org\/10.1177\/10668969241235316","relation":{"has-review":[{"id-type":"doi","id":"10.1177\/10668969241235316\/v1\/review1","asserted-by":"object"},{"id-type":"doi","id":"10.1177\/10668969241235316\/v1\/decision1","asserted-by":"object"},{"id-type":"doi","id":"10.1177\/10668969241235316\/v2\/response1","asserted-by":"object"},{"id-type":"doi","id":"10.1177\/10668969241235316\/v2\/decision1","asserted-by":"object"}]},"ISSN":["1066-8969","1940-2465"],"issn-type":[{"value":"1066-8969","type":"print"},{"value":"1940-2465","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,18]]}}}