Metastatic medullary thyroid carcinoma to the breast: Radiological features

Abstract Breast carcinoma is one of the commonest malignancies in women, however metastatic involvement of the breast is extremely rare. The lymphomas and other neoplasms of hematological origin are the most common extra-mammary malignancies that may metastasize to the breast. Medullary carcinoma of the thyroid rarely metastasizes to the breast. It is important to accurately differentiate a metastatic lesion from a primary malignancy in the breast to avoid unnecessary surgical procedures and to implement an appropriate systemic therapy. We report the mammographic, ultrasonographic and color Doppler findings of an unusual case of medullary thyroid carcinoma metastatic to the breast with clinico-pathological correlation.