Fig. 3. Infected galactocele in 32-year-old lactating female presenting with right breast swelling and pain.

A. Mammogram of right breast in mediolateral oblique projection shows well-defined predominantly lucent mass with some opaque material within (white arrow). This appearance is in keeping with presence of both lucent fat and dense proteinaceous content (milk and inflammatory cells). B. Ultrasound demonstrates large collection in right breast with heterogeneous cystic-solid content. This lesion was aspirated which yielded milk content and inflammatory cells. No malignant cell was observed. Subsequent follow-up ultrasound examinations reveal gradual resolution of this lesion.