Source:http://linkedlifedata.com/resource/umls/id/C0334347
NCI: A benign epithelial neoplasm with eccrine or apocrine differentiation, arising from the sweat glands. It usually presents as a solitary, well circumscribed, firm nodule in the face and upper trunk. It is characterized by the presence of basaloid cells forming nodules in the dermis. Cases of carcinoma arising from long standing spiradenomas have been reported.