Adenoid cystic carcinoma of the cervix, an aggressive tumor, shows the same histologic features as adenoid cystic carcinoma of the salivary glands. It is characterized by small cells in a cribriform, pseudoglandular pattern with hyaline cylinders. The authors present the ultrastructural features of two cases of adenoid cystic carcinoma of the cervix. Both tumors were composed of epithelial cells, myoepithelial cells, and cylinders formed of reduplicated basement membrane. In addition, the second case had neuroendocrine differentiation.
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