| Definition: |
The lesion is characterized microscopically by epithelial cells with atypical hyperchromatic nuclei, vacuolization, intratubular lumina formation, infrequent apoptosis, and rare mitotic figures. In contrast to germ cells, the cells of CEH do not express alpha-fetoprotein, carcinoembryonic antigen, or S-100. Ultrastructurally, the cells are pleomorphic with stereocilia at their apical borders and within intratubular lumina, and are supported by a basement membrane. CEH does not appear to be a preneoplastic change. |