Eccrine spiradenoma and dermal cylindroma.

The homologous nature and morphological similarities between cutaneous and salivary gland tumors have been well documented. This is especially true of the monomorphic adenoma, eccrine spiradenoma and cylindroma. Prior to the first full clinical and pathological description, about twenty-five years ago, the lesion of eccrine spiradenoma had been given multiple synonyms. This report is of a patient with an eccrine spiradenoma in the buttock and dermaltype cylindroma of the parotid gland. This may represent the transformation of pleuripotential basal cells originating in the parotid and eccrine sweat gland.