Malignant clear-cell hidradenoma of the toe.

Malignant sweat gland tumors are rare tumors of the extremity. Their insidious growth patterns and often confusing pathological characteristics can cause confusion with more common benign tumors. However, these tumors cannot be neglected because they do have a propensity to metastasize. Presented is a 56-year-old woman with a malignant clear-cell hidradenoma of the foot actually presenting as a benign lesion.