Histomorphological description of the transformation of a verruca vulgaris into squamous cell carcinoma. Discussion of the oncogenesis by virus.

Description of a case of M. Bowen developing from condylomata acuminata. The ultrastructural alterations of the wart cells and the possible influence of papova-virus on carcinogenesis are discussed.

We report the case of a 15-month-old child suffering from diffuse cutaneous mastocytosis characterized by blisters and widespread skin involvement but without systemic manifestations. Skin biopsies were examined by electron microscopy. We observed various alterations in the morphology of mast cells and mast cell granules.