多数の角質嚢腫を伴いKeratoacanthome plurikystique pseudo-sébacé (Degos) に相当する有棘細胞癌の1例

The case of a 71-year-old male with keratoacanthome pluri-kystique pseudo-sebace (Degos) is reported. The patient noticed a plaque on his chin two months ago. The plaque gradually enlarged and on the first visit to our hospital, a 45×40mm sized, irregularly bordered and shaped reddish plaque that was composed of yellowish multilobular cysts was observed. On light microscopy, many cysts lined by stratified squamous epithelium with a granular layer and filled with layers of keratin were observed. Cysts in the dermis extended into the muscle layer. This is a most peculiar case consistent with keratoacanthome pluri-kystique pseudo-sebace (Degos), which we regard as a type of squamous cell carcinoma.