[Dysplasia and cancer].

Problems of morphological features and nature of dysplasia and its role in blastomogenesis are discussed. It is pointed out that the term "dysplasia" is used in modern pathology to designate various processes including disembryogenetic, adaptive-hyperplastic and pretumourous ones. The necessity of a uniform interpretation of this term is underlined, its definition is given and it is suggested to distinguish between metaplastic processes and dysplasia.