Carcinoma Breast Presenting with Concurrent Extensive Lymph Nodal Sarcoidosis.

Sarcoidosis is a systemic disease characterized by noncaseating granulomas involving any organ. Concurrent carcinoma breast with sarcoidosis is a rare occurrence. A 51-year-old female presented with right breast lump and was diagnosed with infiltrating ductal carcinoma with lymph nodal (LN) metastases (estrogen receptor, progesterone receptor positive, and HER2neu negative). Baseline fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) scan revealed breast mass with multiple LNs. Biopsy of iliac and internal mammary LNs indicated granulomatous lymphadenitis. A possible diagnosis of sarcoidosis was considered. End of chemotherapy (4 EC, 12 paclitaxel), FDG PET/CT revealed a complete metabolic response in breast mass. Most lymph nodes were resolved. Modified radical mastectomy specimen was negative for breast malignancy with granulomatous lymphadenitis in LNs.