Giant Lactating Adenoma With Fibroadenomated Changes

Abstract

Lactating adenomas (LAs) are uncommon benign breast tumors that typically occur in the late pregnancy or lactation period and are among the most prevalent breast lesions during puerperium. They commonly present with a painless, rapidly growing, large, mobile breast lump either late in pregnancy or the postpartum period. Despite being a condition, a core biopsy is almost always required to exclude malignancy. We are presenting a case of a 34-year-old patient who was referred to our unit with a progressive increase in size of the pre-existing right breast lump that has been there before pregnancy. Due to the massive increase in size in a short period, the lump was removed shortly after delivery with an acceptable cosmetic outcome.

Keywords: benign breast disease; fibroadenomatoid change; lactating adenoma; pregnancy related breast changes.

Figure 1. Right breast USS prior to pregnancy showing a U3 52 mm, heterogeneous hypoechoic lesion.

USS, ultrasound scan

Figure 2. Right breast USS at 12 weeks showing a considerable increase in the size of previous lesion to 91 mm.

USS, ultrasound scan

Figure 3. Bilateral breast MRI at 23 weeks showing 11.7 mm well-circumscribed hamartoma occupying the lower half of the breast with vivid heterogeneous enhancement and some central unenhanced dendritic-like areas.

Figure 4. Histopathology specimen showing a 145 mm x 75 mm x 60 mm, oval, bosselated, firm lump.