Lichenoid dysplasia: a distinct histopathologic entity.

We have observed, both in the literature and in practice, that pathologists frequently fail to appreciate subtle dysplastic features in lesions with lichenoid histomorphology. Aside from the obvious diagnostic errors, such oversight can lead to mistaken impressions concerning the natural behavior of relatively benign processes. Accordingly, we have enumerated histologic criteria which define the entity known as "lichenoid dysplasia." Histologic features of lichenoid dysplasia are illustrated and compared with those of other lichenoid lesions, including lichen planus plus nonspecific lichenoid stomatidides. The rationale for and the advantages and objectives of this classification are discussed.