Dysplasia in Greek means bad formation. The term is used to refer to an abnormality in maturation of cells within a tissue. This generally consists of an expansion of immature cells, with a corresponding decrease in the number and location of mature cells.
Dysplasia is often indicative of an early neoplastic process.
The term dysplasia is typically used when the cellular abnormality is restricted to the originating tissue, as in the case of an early, in-situ neoplasm.