Зображення 00502. Keratoacanthoma

Keratoacanthoma is a benign, but rapidly growing skin tumour. Typically the base is surrounded by an epithelial collar and the central part forms a quite prominent hyperkeratotic mass. The histopathological differential diagnosis between keratoacanthoma and squamous cell carcinoma is difficult, if not even impossible. Excision or cryosurgery with liquid nitrogen are useful therapeutic alternatives.