The fine structures of three colloid cysts derived from the region of the foramen of Monro have been examined. Two types of cells, a lighter, ciliated and a denser, nonciliated cell formed the single layered epithelial lining. The surface of the nonciliated cells was coated with an electron-dense material. The fine structure of the cysts suggests that they are derived from an endodermal structure rather than from ncuroepithclium.
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Hirano et al. (1974) studied this question.