{"title":"Spontaneous cholangiofibrosis adjacent to a dilated common bile duct with intestinal metaplasia in a Royal College of Surgeons rat.","authors":"Kiyokazu Ozaki, Yui Terayama, Tetsuro Matsuura","doi":"10.1293/tox.2021-0032","DOIUrl":null,"url":null,"abstract":"<p><p>A 130-week-old male Royal College of Surgeons rat kept as a non-treated animal in a long-term animal study presented with a mass in the hepatic portal region that adhered to a dilated common bile duct and the duodenum. Histopathologically, the solitary mass showed expansive growth with no apparent compression and continued to dilate the common bile duct, which had a hyperplastic epithelium with intestinal metaplasia. The mass mainly consisted of small to large dilated and/or tortuous ducts with abundant dense connective tissue and many inflammatory cells. The single-layer lining epithelium of the duct changed from cuboidal to columnar. Immunohistochemically, the lining cells were positive for cytokeratin 7, cytokeratin 19, and OV-6, which are bile duct markers. Based on the pathological characteristics, the rat was diagnosed as spontaneous cholangiofibrosis adjacent to a dilated common bile duct with intestinal metaplasia.</p>","PeriodicalId":17437,"journal":{"name":"Journal of Toxicologic Pathology","volume":"34 4","pages":"339-343"},"PeriodicalIF":0.9000,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/ef/8e/tox-34-339.PMC8484927.pdf","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Toxicologic Pathology","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1293/tox.2021-0032","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2021/7/17 0:00:00","PubModel":"Epub","JCR":"Q4","JCRName":"PATHOLOGY","Score":null,"Total":0}
引用次数: 1
Abstract
A 130-week-old male Royal College of Surgeons rat kept as a non-treated animal in a long-term animal study presented with a mass in the hepatic portal region that adhered to a dilated common bile duct and the duodenum. Histopathologically, the solitary mass showed expansive growth with no apparent compression and continued to dilate the common bile duct, which had a hyperplastic epithelium with intestinal metaplasia. The mass mainly consisted of small to large dilated and/or tortuous ducts with abundant dense connective tissue and many inflammatory cells. The single-layer lining epithelium of the duct changed from cuboidal to columnar. Immunohistochemically, the lining cells were positive for cytokeratin 7, cytokeratin 19, and OV-6, which are bile duct markers. Based on the pathological characteristics, the rat was diagnosed as spontaneous cholangiofibrosis adjacent to a dilated common bile duct with intestinal metaplasia.
期刊介绍：
JTP is a scientific journal that publishes original studies in the field of toxicological pathology and in a wide variety of other related fields. The main scope of the journal is listed below.
Administrative Opinions of Policymakers and Regulatory Agencies
Adverse Events
Carcinogenesis
Data of A Predominantly Negative Nature
Drug-Induced Hematologic Toxicity
Embryological Pathology
High Throughput Pathology
Historical Data of Experimental Animals
Immunohistochemical Analysis
Molecular Pathology
Nomenclature of Lesions
Non-mammal Toxicity Study
Result or Lesion Induced by Chemicals of Which Names Hidden on Account of the Authors
Technology and Methodology Related to Toxicological Pathology
Tumor Pathology; Neoplasia and Hyperplasia
Ultrastructural Analysis
Use of Animal Models.
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