[Chondroid hidradenoma. Immunohistologic detection of cytokeratin and calmodulin]

The chondroid hidradenoma (chondroid syringoma, mixed tumor of skin) is a rare benign tumor with eccrine differentiation. It is composed of both adenoid structures surrounded by a mucoid stroma and "chondroid" single cells. Tumor cells with immunoreactive calmodulin were found predominantly in the centre of adenoid structures, whereas cells expressing cytokeratin were preferable located as the margins.