An electron microscopic study was made comparing an adenomatoid tumor with a hemangioma, lymphangioma, and 2 mesotheliomas in an attempt to elucidate the cell of origin of the adenomatoid tumor. Using ultrastructural criteria, one could say that neither the hemangioma or lymphangioma were structurally related to the adenomatoid tumor. It was not possible to morphologically distinguish between the cells of the mesothelioma and that of the adenomatoid tumor.
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