Mammary Myofibroblastoma in a male patient
A 68-year-old male presented with a tender, palpable mass of the left breast in the 11 o’clock position which had been present for 3 months. The patient had a history of prostate cancer, raising the concern for metastatic carcinoma as a differential diagnosis. The patient underwent a diagnostic bilateral mammogram which showed scattered calcifications and a mass with macrolobulated margins measuring 2.3 x 1.2 x 2.0 cm. Ultrasound-guided core biopsy of the left breast mass was performed and revealed myofibroblastoma of the breast. Diagnostic mammogram revealed a high density lesion with macrolobulated margins at the 11 o’clock position in the left breast without spiculated borders. Scattered calcifications were visualized within the left breast. It was classified as BI-RADS 4 (suspicious finding) and ultrasound-guided biopsy was recommended. Focused ultrasound demonstrated an elongated hyperechoic mass with smooth margins measuring 2.3 x 1.2 x 2.0 cm. There was minimally increased color flow internally. Elastography showed both hard and soft areas within the mass. Ultrasound-guided biopsy was performed using a 14-gauge coaxial biopsy gun and 4 core biopsy samples were obtained. Pathology results classified the mass as a myofibroblastoma of the breast.