Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, January 2017
Keratosis lichenoides chronica (KLC) is characterised by violaceous, papular and nodular lesions in a linear or reticulate pattern.
Histology of keratosis lichenoides chronica
Histologically, keratosis lichenoides chronica is characterised by a lichenoid reaction pattern with marked basal cell death and vacuolar degeneration (figures 1-3). The dermalinfiltrate shows a mixture of cells which may include plasma cells. The epidermal changes are highly variable — acanthosis, parakeratosis and atrophy are all described features. Cornoid lamellae and eccrineinfiltrates have been described.