Although eccrine adenoma is usually situated on the distal portions of the extremities, we present a case localized in the vicinity of a mammary gland near axilla. The clinical diagnosis was of a mammary fibroadenoma with associated apocrine type of adenomere, supported by a myxomatous stromal tissue. The diagnosis was of an eccrine adenomyxoma. We continue with a review of the problems of microscopical differential diagnosis.