Abstract

A case of multiple malignant trichilemmoma on the left forehead and the right chest in a 74-year-old man is reported. The lesion on the right chest was the annular tumor measuring 40×35mm in size with a granular surface. Histopathological examination revealed that no cancer cells were found in the atrophic epidermis on the central area of the annular tumor and that several lymphocytes surrounded and attached to cancer cells on the inner boundary of the annular tumor. Pigmentary incontinence and many mononuclear cell infiltrates were observed in the upper dermis of the central area. A recent review of 73 cases of malignant trichilemmoma reported in Japanese literatures revealed that the lesion in multiple forms was presented in four cases (5.5%) and the annular lesion was presented in only one case (1.4%) in which cancer cells existed in the central area.