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Combination of a Teratoma and Embryonal Carcinoma of the Testis in SD IGS Rats: A Report of Two Cases

Chemicals Evaluation and Research Institute, 3-822, Ishii-machi, Hita 877-0061, Japan, sawaki-masakuni{at}fat.coara.or.jp

Kazutoshi Shinoda

Chemicals Evaluation and Research Institute, 3-822, Ishii-machi, Hita 877-0061, Japan

Satsuki Hoshuyama

Chemicals Evaluation and Research Institute, 3-822, Ishii-machi, Hita 877-0061, Japan

Fumie Kato

Chemicals Evaluation and Research Institute, 3-822, Ishii-machi, Hita 877-0061, Japan

Kanji Yamasaki

Chemicals Evaluation and Research Institute, 3-822, Ishii-machi, Hita 877-0061, Japan

Testicular tumors of germ cell origin are extremely rare in rats. We encountered 2 cases of teratoma and embryonal carcinoma in the testes of 8- and 10-week-old Sprague-Dawley IGS rats. A unilateral tumor mass with bilateral testicular atrophy was observed macroscopically in both cases. Microscopic examination revealed that the tumor mass had characteristic features of a teratoma and was composed of several types of differentiated cells and tissues at various stages of maturation. Embryonal carcinoma tissue, composed of undifferentiated cells with an embryonic and anaplastic appearance, was observed within the tumor mass. In addition, foci of intratubular teratomas and embryonal carcinomas were observed in the testis on the side without any obvious mass. No obvious germ cells were observed in the seminiferous tubules in the remnant nontumorous area. Furthermore, intratubular transition of cells was observed from the embryonal carcinoma tissue to the squamous epithelium. This finding indicates that an embryonal carcinoma differentiates toward a teratoma even at a very early stage of development of the germ cell tumor.

Key Words: Teratoma • embryonal carcinoma • teratocarcinoma • germ cell tumor • testis • rats

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Toxicologic Pathology, Vol. 28, No. 6, 832-835 (2000)
DOI: 10.1177/019262330002800611


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This Article Abstract Free Full Text (Free PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Sawaki, M. Articles by Yamasaki, K. Search for Related Content PubMed PubMed Citation Articles by Sawaki, M. Articles by Yamasaki, K. Social Bookmarking                         What's this?