
Malignant fibrous histiocytomas were found in eight F344 rats and four Sprague-Dawley rats. They appeared to originate in skin or peritoneum and to have metastasized to liver and lung. Tumor cells appeared to be histiocytic in the light microscopic studies and fibroblastic after ultrastructural evaluation. The cell of origin was uncertain.
Lung Neoplasms, Skin Neoplasms, Histiocytoma, Benign Fibrous, Liver Neoplasms, Animals, Peritoneal Cavity, Rats, Inbred F344, Rats
Lung Neoplasms, Skin Neoplasms, Histiocytoma, Benign Fibrous, Liver Neoplasms, Animals, Peritoneal Cavity, Rats, Inbred F344, Rats
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