[Lichen planus verrucosum and spinocellular carcinoma]

A case of lichen planus verrucosus of the legs in a 29 year old patient is presented by the authors. 18 years after the outset a squamous cell carcinoma giving rise to lymph node metastasis appeared on a lesion localized on the external side of the right leg. The chronic inflammation and the traumatism are the only carcinogenetic factors to be considered. In this case there were no antecedents of arsenic administration. The therapy with bleomicin and R.X. was effective. The review of the literature shows the extreme rarity of the malignant transformation of the lichen planus verrucose.