Apocrine metaplasia of the breast is a benign breast condition and is sometimes considered part of or associated with fibrocystic change. It is a common finding in the female breast particularly after the age of 25 and many regard it as a normal component of the breast.
Seen mostly in women over the age of 50 years.
Metaplastic changes occur secondary to some kind of irritation, most often being a breast cyst. Apocrine-like cells form in a lining of developing microcysts due to the increased intraluminal pressure caused by secretions.
Mammographic features are non specific.
There are no distinguishing mammographic features although a new or enlarging lobular, microlobulated mass or heterogeneous calcification cluster may sometimes represent apocrine metaplasia. When this is seen, a needle biopsy is required for definitive diagnosis 1.
Ultrasound may show a cluster of small (2-5 mm) anechoic foci with intervening septae 3.
- breast fibrocystic disease
- breast cancer
When there is hyperplasia seen along with metaplasia there is an increased risk of developing breast cancer.
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