Fig. 8

Histopathologic microphotographs of the specimen with hematoxylin and eosin staining. a Incisional biopsy before surgery showing downward growth of numerous thickened, bulbous rete ridges of squamous cells (× 100). b Surgical specimen showing exophytic growth pattern with prominent keratin layer arranged in compressed invaginating fold (× 50). c Hyperplastic epithelium showing blunt projections rather than infiltration of the underlying tissue with dysplasia and hyperplasia of the basal cell layer (× 50). d A group of epithelial cells proliferating within the maxillary bone with bony destruction (× 50)