Source:http://linkedlifedata.com/resource/umls/id/C1266063
NCI: A very rare, aggressive carcinoma of the sweat glands arising from malignant transformation of a long standing spiradenoma. It usually grows in the upper extremities, lower extremities, trunk, and head and neck. It has the tendency to recur and metastasize most often to the lymph nodes, bones, and lungs.