Seminoma (Germinoma) Apparently Primary in the Anterior Mediastinum

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Abstract
TERATOID tumors originating in the anterior mediastinum are well known. In our experience they constitute the commonest tumor at this site. The majority are cystic and benign.1 Morphologically, various derivatives of the three germ layers are encountered in these benign tumors, including neural tissue, skin and appendages, teeth, bone, cartilage, muscle, endothelial tissue, respiratory epithelium and pancreas.Malignant teratomas make up a relatively small group of primary anterior mediastinal tumors. Microscopically, they exhibit fewer well differentiated structures than benign tumors do. The malignant component, as in malignant teratomas elsewhere, is usually adenocarcinoma (teratocarcinoma). These two groups of tumors are commonly . . .

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