Abstract
Metastases in medullary carcinoma thyroid are not an uncommon phenomenon; however, metastases to the breast are extremely rare. Authors are reporting a rare case of medullary carcinoma thyroid metastases to breast in a 42-year-old female. Biopsy was performed to distinguish between primary duct carcinoma and metastatic medullary carcinoma thyroid. Further investigations revealed multiple involvements of cervical as well as axillary lymph nodes, bones, lungs, and dermis. Though survival of isolated metastases of medullary carcinoma thyroid to the breast may be better compared to other solid tumors of the breast, with wide spread dissemination survival is poor. Breast metastases on presentation seem to be a manifestation of wide spread disease.
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