Yamane R, Tanaka M, Kaneda S. Spontaneous hemangiosarcoma in the spleen and liver of a young rat.
J Toxicol Pathol 2022;
35:89-93. [PMID:
35221499 PMCID:
PMC8828605 DOI:
10.1293/tox.2021-0042]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 08/04/2021] [Indexed: 11/19/2022] Open
Abstract
Spontaneous hemangiosarcoma in young rats is rare. In this report, we describe a case of
a spontaneous hemangiosarcoma in the spleen and liver of young rats. At necropsy, multiple
pale red masses were observed in the spleen. Histopathologically, solid growth and
haphazardly arranged neoplastic cells were observed, although no characteristic growth
pattern was observed. In contrast, irregularly sized small slit-shaped spaces containing
erythrocytes were found among the neoplastic cells. Reticular fibers incompletely
surrounding the neoplastic cells were observed by silver staining. Immunohistochemistry
revealed that the neoplastic cells were positive for vWF and CD34. Electron microscopic
examination revealed that the neoplastic cells had erythrocytes in the lumen and
Weibel-Palade bodies in the cytoplasm and were arranged along a discontinuous basal
lamina. These features indicate that the tumor originated from vascular endothelial cells.
Based on these results, the tumor was diagnosed as a hemangiosarcoma in the spleen and
liver.
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