[Ultrastructure of villous adenomas of the large intestine]

7 villous adenomas of the colon from patients of 44 to 63 years are studied electron-microscopically. Their cells are shown to preserve the capacity for specific differentiation. 4 types of differentiated cells are distinguished and changes connected with the processes of structural-functional restructuration are described. The existence of two ultrastructural variants of villous adenomas depending upon the proportion of differentiated and nondifferentiated cells is noted. Prognostic value of these findings is discussed.