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KMID : 0379520110270030149
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한국독성학회지
2011 Volume.27 No. 3 p.149 ~ p.152
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Spontaneous Multicentric Malignant Schwannoma in a Male Fischer 344 Rat
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Kim Bang-Hyun
Cho Wan-Seob
Han Beom-Seok
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Abstract
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We describe here a multicentric spontaneous malignant schwannoma obtained from one male F344 rat, and this animal was the subject of a carcinogenicity study for which it was treated with diisodecyl phthalate. The animal of the control group not treated with diisodecyl phthalate showed dyspnea and severe lordosis. On the necropsy, two tan, firm, encapsulated masses were observed in the subcutis of the lumbosacral region and the left inguinal region of the abdominal cavity, respectively; the masses were 25 × 17 × 8 mm and 16 × 14 × 8 mm in size, respectively. Histologically, the tumor consisted of spindle and pleomorphic cells that grew in various patterns, that was, sweeping fascicles and herringbone and local organoid patterns. The pleomorphic neoplastic cells had more than two nuclei. Additionally, the diagnosis of malignant schwannoma was confirmed by the immune reactivity of the tumor cells for S-100 protein.
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KEYWORD
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Multicentric spontaneous malignant schwannoma, F344 rat, S-100 protein
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