Case report with light- and electron-microscopic examination and immunohistochemical study of alpha-fetoprotein

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A case of yolk sac tumor of the anterior mediastinum was studied by light and electron microscopy and found to have characteristic patterns which were similar to a neoplasm of gonadal origin. These findings, in addition to the immunohistochemical identification of alpha-fetoprotein in the tumor, indicated that the neoplasm was germ cell in origin. A brief review of previously reported cases is included. Prognosis of the patients with yolk sac tumor of the anterior mediastinum was generally dismal; however, those patients with tumors incidentally found but completely excised survived without evidence of recurrence.

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