Ultrastructure and observations on the histogenesis of mesotheliomas “adenomatoid tumors” of the female genital tract

The morphological characteristics of three mesotheliomas, the so-called “ade-nomatoid tumors” of the female genital organs, were studied by light and electron microscopy, in search of information on the histogenesis of these neoplasms. The histology and ultrastructure of normal peritoneal mesothelium of the urogenital region were also studied for comparative correlation. The observations made in this investigation strongly support the theory that these tumors are of mesothelial origin. It is then proposed that the term mesothelioma be encouraged to designate these benign neoplasms of the genital sphere.