Liver - Intrahepatocellular Erythrocytes
comment:Intrahepatocellular erythrocytes are uncommon and may be seen as a spontaneous change in aging mice. However, in some NTP studies, this change appears to have been exacerbated by treatment. At low magnification, it may be confused with angiectasis; at higher magnification, enlarged hepatocytes are filled and expanded by numerous erythrocytes. Speculation that this change occurs by erythrophagocytosis or emperipolesis has not been confirmed by ultrastructural studies.
recommendation:Intrahepatocellular erythrocytes should be documented whenever present, and the pathology narrative should include a description of the extent of the change. Any associated degenerative or other changes in the hepatic parenchyma should be diagnosed separately if warranted by the severity of these lesions; otherwise, they should be mentioned in the pathology narrative.
Barni S, Bernocchi G. 1991. Internalization of erythrocytes into liver parenchymal cells in naturally hibernating frogs (Rana esculenta L.). J Exp Zool 258:143-150. Abstract: http://www.ncbi.nlm.nih.gov/pubmed/2022945
Harada T, Enomoto A, Boorman GA, Maronpot RR. 1999. Liver and gallbladder. In: Pathology of the Mouse: Reference and Atlas (Maronpot RR, Boorman GA, Gaul BW, eds). Cache River Press, Vienna, IL, 119-183. Abstract: http://www.cacheriverpress.com/books/pathmouse.htm
Lee KP. 1983. Peliosis hepatis-like lesion in aging rats. Vet Pathol 20:410-423. Abstract: http://www.ncbi.nlm.nih.gov/pubmed/6623845
Thoolen B, Maronpot RR, Harada T, Nyska A, Rousseaux C, Nolte T, Malarkey D, Kaufmann W, Kutter K, Deschl U, Nakae D, Gregson R, Winlove M, Brix A, Singl B, Belpoggi F, Ward JM. 2010. Hepatobiliary lesion nomenclature and diagnostic criteria for lesions in rats and mice (INHAND). Toxicol Pathol 38:5S-81S. Full Text: http://tpx.sagepub.com/content/38/7_suppl/5S.full
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