Abstract
A 53-year-old Japanese male was first examined in July 1991, because of a painful dome-shaped, dark red nodule on the left temporal scalp. The surface of the nodule was smooth and it was 17×15×11 mm in size. The tumor was excised surgically and examined by histopathological and immunohistochemical studies. The histological features revealed a well-demarcated solitary mass localized in the upper and middle dermis. A connection to the epidermis through a comedone-like conduit was seen. Tubular structures were lined by two layers of epithelial cells, and the inner layer of cells showed decapitation secretion. The luminal continent was PAS positive and diastase resistant, but the mucicarmine was negative. Immunohistochemically, CEA and S100 protein were both positive at the luminal surface of the tumor cells.
