Verruciform xanthoma of the oral mucosa. Report of a case.

Verruciform xanthoma is a rare benign lesion of unknown etiology and pathogenesis, although an inflammatory process seems to be implicated in its origin. It usually shows a slow-growing small lesion which can be sessile or pedunculated and has a typical rough and granular surface. A clinical case of an asymptomatic verruciform xanthoma of the ventral surface of the tongue in a 24-year-old male is reported. The lesion was noticed for the first time during a routine dental examination and it appeared as a sessile whitish verrucous lump hard in texture. An incisional biopsy followed by the excision of the whole lesion was performed. The histological and immunohistochemistry examinations were carried out using antibodies CD68-KP1, CD68-PGM1, alpha-1-antitrypsin and vimentin, desmin, cytokeratins, NSE and S-100. Histology showed epithelial degeneration. The connective tissue papillae were entirely occupied by foamy cells that were positive for CD68-KP1, CD68-PGM1, alpha-1-antitrypsin and vimentin and negative for desmin, cytokeratins, NSE and S-100. The foamy cells were characterized by a large granulous cytoplasm and small picnotic nuclei. In accordance with the literature, the immunohistochemistry analysis confirmed that foamy cells are likely to have a macrophagic origin and that epithelial degeneration could be correlated with the pathogenesis of this lesion.