[Co-occurrence of plane and verrucous leukoplakia evolving into an invasive squamous cell carcinoma].

A 40-year old female patient showed extended areas of homogeneous and verrucous leukoplakias on the floor of her mouth. In addition, we found leukoplakia of the speckled type on her right lower alveolar ridge. Histological examination of specimens taken from this region revealed squamous cell carcinoma with invasion into the mandibular bone. Heavy smoking as well as chronic irritation caused by a poorly fitted denture were considered predisposing factors. We carried out radical excision of the carcinoma and the verrucous leukoplakias including partial bone resection. During a follow-up period of two years, we did not observe any recurrences of the carcinoma.