Metastatic breast lesion from thymic carcinoma

Metastases to the breast from other organs are not common. Among lesions metastatic to the breast, carcinoma of the opposite breast, multicentric lymphoid malignancies, and disseminated melanoma constitute the most likely sources. Thymic carcinoma is a rare malignant neoplasm representing 0.2% to 1.5% of all malignancies. The incidence of distant metastasis from thymic carcinoma varies from 1.5% to 15.5%, and the tumor metastasizes most frequently to the liver, followed by the kidney and extrathoracic lymph nodes. We present a case of thymic carcinoma metastatic to the breast. To our knowledge, this is the first report of thymic carcinoma metastatic to the breast.