Testis, Interstitial Cell - Syncytial Cells
comment:The syncytial cell formation is unusual and has not been described in the literature. The interstitial syncytial cells may represent Leydig cells or macrophages. These can be distinguished using a Periodic acid-Schiff stain, which stains macrophages but not Leydig cells. The pathogenesis and significance of this lesion are unknown.
recommendation:Interstitial syncytial cells should be diagnosed and graded when present and should be discussed in the pathology narrative if the incidence and/or severity appears to be related to chemical administration. Diagnosis should indicate bilaterality when present.
Creasy D, Bube A, de Rijk E, Kandori H, Kuwahara M, Masson R, Nolte T, Reams R, Regan K, Rehm S, Rogerson P, Whitney K. (2012). Proliferative and nonproliferative lesions of the rat and mouse male reproductive system. Toxicol Pathol 40:40S-121S. Abstract: http://www.ncbi.nlm.nih.gov/pubmed/22949412
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