* Age - usually over 60 years old * Sex - males are more prone * Site - gingiva, buccal mucosa, alveolar mucosa, hard palate, floor of the mouth, larynx, oesophagus, penis, vagina, scrotum. * Clinical presentation: * It is a slow growing, diffuse, exophytic lesion usually covered by leukoplakic patches. * Invasive lesions quickly invade bones. * It can rapidly become fixed with underlying periosteum and cause gradual destruction of jaw bone. * Enlarged regional lymph nodes. * Lesion shows painful multiple rugae-like folds and deep clefts between them. * Regional lymph nodes tender and enlarged. * Pain and difficulty in mastication.
Verrucous carcinoma
Anaplastic carcinoma
Basal-like carcinoma
Mucinous carcinoma
Adenosarcoma
Lymphoepithelioma-like carcinoma
Mammoplasia
Epithelial-myoepithelial carcinoma