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A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst
We examined a 110-week-old RccHan(TM): WIST Wistar male rat from a carcinogenicity study. No clinical signs were observed, and the rat was sacrificed at the end of the study. Macroscopically, within the midline of the sphenoid bone, was a 10 mm, non-infiltrative, soft, heterogeneous mass. Microscopi...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Japanese Society of Toxicologic Pathology
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7396730/ https://www.ncbi.nlm.nih.gov/pubmed/32764844 http://dx.doi.org/10.1293/tox.2019-0068 |
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author | Polledo, Laura Kreutzer, Robert Okazaki, Yoshimasa Razinger, Tanja Weber, Klaus |
author_facet | Polledo, Laura Kreutzer, Robert Okazaki, Yoshimasa Razinger, Tanja Weber, Klaus |
author_sort | Polledo, Laura |
collection | PubMed |
description | We examined a 110-week-old RccHan(TM): WIST Wistar male rat from a carcinogenicity study. No clinical signs were observed, and the rat was sacrificed at the end of the study. Macroscopically, within the midline of the sphenoid bone, was a 10 mm, non-infiltrative, soft, heterogeneous mass. Microscopic evaluation showed an expansile, cystic proliferation, consisting of two patterns of epithelial lining: well-differentiated areas lined by a single layer to a pseudostratified, ciliated-cuboidal epithelia with Goblet cells compatible with Rathke’s cleft cyst; and poorly differentiated ones that formed irregular papillary projections, covered by atypical epithelia with squamous differentiation and hyperkeratosis compatible with areas of craniopharyngioma. Pleomorphisms were high in atypical areas with up to 2–3 mitotic figures per high power field. Within the cystic cavities, there was abrupt keratinization, mucus, cholesterol clefts, and foci of foamy macrophages. Immunohistochemistry revealed strong pancytokeratin immunolabelling of neoplastic cells confirming the epithelial origin. Well-differentiated epithelial lining showed cytokeratin-20 and cytokeratin-8 immunoreactivity, whereas the atypical squamous epithelium presented with a loss of cytokeratin-20 positive signal and weak to moderate positivity with cytokeratin-8. Areas compatible with a Rathke’s cleft cyst and craniopharyngioma were considered to co-exist in the same mass. |
format | Online Article Text |
id | pubmed-7396730 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Japanese Society of Toxicologic Pathology |
record_format | MEDLINE/PubMed |
spelling | pubmed-73967302020-08-05 A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst Polledo, Laura Kreutzer, Robert Okazaki, Yoshimasa Razinger, Tanja Weber, Klaus J Toxicol Pathol Case Report We examined a 110-week-old RccHan(TM): WIST Wistar male rat from a carcinogenicity study. No clinical signs were observed, and the rat was sacrificed at the end of the study. Macroscopically, within the midline of the sphenoid bone, was a 10 mm, non-infiltrative, soft, heterogeneous mass. Microscopic evaluation showed an expansile, cystic proliferation, consisting of two patterns of epithelial lining: well-differentiated areas lined by a single layer to a pseudostratified, ciliated-cuboidal epithelia with Goblet cells compatible with Rathke’s cleft cyst; and poorly differentiated ones that formed irregular papillary projections, covered by atypical epithelia with squamous differentiation and hyperkeratosis compatible with areas of craniopharyngioma. Pleomorphisms were high in atypical areas with up to 2–3 mitotic figures per high power field. Within the cystic cavities, there was abrupt keratinization, mucus, cholesterol clefts, and foci of foamy macrophages. Immunohistochemistry revealed strong pancytokeratin immunolabelling of neoplastic cells confirming the epithelial origin. Well-differentiated epithelial lining showed cytokeratin-20 and cytokeratin-8 immunoreactivity, whereas the atypical squamous epithelium presented with a loss of cytokeratin-20 positive signal and weak to moderate positivity with cytokeratin-8. Areas compatible with a Rathke’s cleft cyst and craniopharyngioma were considered to co-exist in the same mass. Japanese Society of Toxicologic Pathology 2020-04-03 2020-07 /pmc/articles/PMC7396730/ /pubmed/32764844 http://dx.doi.org/10.1293/tox.2019-0068 Text en ©2020 The Japanese Society of Toxicologic Pathology This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Case Report Polledo, Laura Kreutzer, Robert Okazaki, Yoshimasa Razinger, Tanja Weber, Klaus A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title | A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title_full | A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title_fullStr | A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title_full_unstemmed | A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title_short | A craniopharyngioma in a Wistar rat most likely originated in a Rathke’s cleft cyst |
title_sort | craniopharyngioma in a wistar rat most likely originated in a rathke’s cleft cyst |
topic | Case Report |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7396730/ https://www.ncbi.nlm.nih.gov/pubmed/32764844 http://dx.doi.org/10.1293/tox.2019-0068 |
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