F5Ch41: The patterns are not as clearly defined as in most of the other illustrative cases; the section was faded. Cytoplasmic pallor, and vacuolated cells are a feature of the component among the whorls, especially on the left. At the deep margin of the lesion, at about the junction between the left and right hand sides of the field, there is a change in cytologic features. This is marked on the right by a population of plump keratinocytes with more convincing features of a superficial unit-like component. All along the dermal-epidermal interface, a thin band of chronic inflammatory cells hug the epithelial component. The inflammatory cells have migrated into the basal layer to produce lysis and dyskeratosis of the respective epithelial cells; the pattern is that of a lichen planus-like reaction. There are numerous melanin deposits in the area of the lichenoid reaction. In part, the adjacent superficial unit-like component might also be included, as a component of the lichenoid reaction.
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