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The goal of the NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers\u2019 presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting and discussion. Some lesions and topics covered during the symposium included a caudal tail vertebra duplication in mice; nephroblastematosis in rats; ectopic C cell tumor in a hamster; granular cell aggregates\/tumor in the uterus of a hamster; Pneumocystis carinii in the lung of a rat; iatrogenic chronic inflammation in the lungs of control rats; hepatoblastoma arising within an adenoma in a mouse; humoral hypercalcemia of benignancy in a transgenic mouse; acetaminophen-induced hepatotoxicity in rats; electron microscopy images of iatrogenic intraerythrocytic inclusions in transgenic mice; questionable hepatocellular degeneration\/cell death\/artifact in rats; atypical endometrial hyperplasia in rats; malignant mixed M\u00fcllerian tumors\/carcinosarcomas in rats; differential diagnoses of proliferative lesions of the intestine of rodents; and finally obstructive nephropathy caused by melamine poisoning in a rat.<\/jats:p>","DOI":"10.1177\/0192623313508020","type":"journal-article","created":{"date-parts":[[2013,12,13]],"date-time":"2013-12-13T23:41:31Z","timestamp":1386978091000},"page":"12-44","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":9,"title":["Proceedings of the 2013 National Toxicology Program Satellite Symposium"],"prefix":"10.1177","volume":"42","author":[{"given":"Susan A.","family":"Elmore","sequence":"first","affiliation":[{"name":"National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA"},{"name":"National Institutes of Health, Bethesda, Maryland, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael C.","family":"Boyle","sequence":"additional","affiliation":[{"name":"National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Molly H.","family":"Boyle","sequence":"additional","affiliation":[{"name":"Integrated Laboratory Systems, Inc., Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle C.","family":"Cora","sequence":"additional","affiliation":[{"name":"National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Torrie A.","family":"Crabbs","sequence":"additional","affiliation":[{"name":"Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Connie A.","family":"Cummings","sequence":"additional","affiliation":[{"name":"Ultrapath Imaging, Durham, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margarita M.","family":"Gruebbel","sequence":"additional","affiliation":[{"name":"Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Crystal L.","family":"Johnson","sequence":"additional","affiliation":[{"name":"Charles River Laboratories, Pathology Associates, Durham, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David E.","family":"Malarkey","sequence":"additional","affiliation":[{"name":"National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth F.","family":"McInnes","sequence":"additional","affiliation":[{"name":"Gribbles Healthscope, Glenside, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Nolte","sequence":"additional","affiliation":[{"name":"Boehringer Ingelheim Pharma GmbH & Co. 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