[A case of adenolipoma of the breast].

A 40-year-old woman was found to have a well-circumscribed mass in the upper outer quadrant of the right breast at a routine physical examination. Mammographically, the tumor was a radiolucent mass, measuring 4.6 X 3.2 X 4 cm, surrounded by a capsule. The tumor consisted of fat and numerous strings with the appearance of ordinary glandular tissue. There was no area of microcalcification. Grossly, the tumor mass was encapsulated by fine connective tissue. On the cut surface, the tumor consisted of fatty tissue containing islands of grayish-white breast tissue. Histologically, the fatty tissue presented (a feature) of mature lipoma. Embedded in the fat were areas of breast tissue simulating fibrocystic disease. In limited areas, the fat cells had direct contact with the ducts without intervening fibrous tissue.