ArticleJournal of toxicologic pathology2023
A mammary fibroadenoma with terminal end buds-like structures in a 7-week-old male SD rat.
Article in Journal of toxicologic pathology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors at 1 institution in 1 country.
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Abstract
We report a case of mammary fibroadenoma in a 7-week-old male SD rat. This case showed rapid growth within one week from the time when the nodule was detected. Histologically, the nodule was a well-circumscribed subcutaneous mass. The tumor consisted of an epithelial component with island-like proliferation (cribriform to tubular patterns) and an abundant mesenchymal component. Alpha-SMA-positive cells were arranged at the periphery of the epithelial component and showed cribriform and tubular patterns. Discontinuous basement membranes and high cell proliferative activities were observed in the cribriform area. These features resembled those of normal terminal end buds (TEBs). Since the mesenchymal component had abundant fine fibers and a mucinous matrix, its stroma was regarded as neoplastic growth of fibroblasts; thus, this tumor was diagnosed as a fibroadenoma. This case is an extremely rare fibroadenoma in that it occurred in a young male SD rat and was composed of an epithelial component showing multifocal proliferation of TEB-like structures and a mucinous mesenchymal component consisting of fibroblasts with fine collagen fibers.
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