Abstract:A whitish mass approximately 30 mm in diameter was noted in the anterior mediastinum of
a 67-week-old female Fischer 344 rat. Histopathologically, two types of tumor cells were
identified on the basis of morphologic features: epithelial tumor cells with a tubular or
cord-like growth pattern and rhabdomyosarcomatous tumor cells characterized by the
presence of cross-striations. Immunohistochemically, the epithelial tumor cells reacted
positively for cytokeratin AE1/AE3, and some reacted positively for p63, whic… Show more
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