Avian Pathol: Unilateral seminoma with multiple visceral metastases in a duck (Anas platyrhynchos).A case of unilateral seminoma seminoma /sem·i·no·ma/ (-no´mah) a radiosensitive, malignant neoplasm of the testis, thought to be derived from primordial germ cells of the sexually undifferentiated embryonic gonad. Cf. germinoma. with visceral metastases in a mallard duck (Anas platyrhynchos) is reported. The right testis was markedly enlarged. The liver surface showed multifocal to coalescent, regular, circular, umbilicated grayish-white spots. In addition, multiple rough whitish nodules were evident on the pancreas and the visceral peritoneum lining the intestine. Histologically, the right testicular parenchyma was diffusely affected and replaced by neoplastic growth, consisting of sheets of large round to polyhedral polyhedral /poly·he·dral/ (-he´dril) having many sides or surfaces. polyhedral having many sides or surfaces. cells with conspicuous vesicular nuclei having distinctly granular chromatin and prominent nucleoli nucleoli plural form of nucleolus. . Sheets of cells with similar features were observed in the other affected organs. Multiple lung metastases were detected on histology. This is the first known report of seminoma with hepatic, pancreatic, pulmonary, and peritoneal metastases in a mallard duck. 2006;35:327-329. |
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