Primary Actinomycosis of the Breast: Case Report

The patient was a 43-year-old woman presented with painful mass in the left breast for 10 days. On physical examination, a hard mass was palpated at the subareolar 9 o’clock direction of the left breast. There was no fever, nipple discharge, tenderness, or palpable axillary lymphadenopathy. Laboratory findings were normal. Mammography demonstrated an ill-defined high density lesion in palpable portion of the subareolar 9 o’clock direction of the left breast. Ultrasound examination showed an ill-defined lobulated, 1.4 × 1.3 cm sized heterogeneously hypoechoic mass with thick hyperechoic boundaries at the subareolar 9 o’clock direction of the left breast. The radiologic findings suggested the possibility of malignancy. Excisional biopsy was done. Histologic examination revealed sulfur granules with microabscesses, consisited with actinomycosis (Fig. 1).