Adenoid Cystic Carcinoma of the Breast: A Case Series of Six Patients and Literature Review
A 56-year-old female was found to have a palpable mass and skin retraction involving the left breast. Mammography and breast US showed a conglomerate mass measuring 2.6 cm and a daughter nodule measuring 0.5 cm in the lower inner quadrant. Breast MRI showed two intensely enhancing round and irregular masses and skin retraction. Left quadrantectomy and axillary lymph node dissection (ALND) were performed. The tumors were ACCs with low nuclear grade, measuring 1.4×1.2×1.2 cm and 1.2×1.1×0.9 cm. No metastatic axillary lymph nodes were observed (pT1N0M0). IHC was negative for ER, PR, and HER2 expression. The patient subsequently received adjuvant radiation therapy. She has been free of recurrence for 65 months.