Malignant mixed tumor of the skin: malignant chondroid syringoma.

Malignant tumors of sweat gland origin are rare. Probably one of the rarest types, still poorly understood, is the so-called malignant chondroid syringoma or malignant mixed tumor of the skin. A case of malignant chondroid syringoma is presented. Ultrastructural study proves very useful for the differential diagnosis with other chondroid or chordoid tumors.