Metastasis to the breast from an adenocarcinoma of the colon.

Metastases to the breast from extramammary malignancies are rare. We report a case of metastasis to the breast from a colonic adenocarcinoma in a 50-year-old man who was 6 years status after a right hemicolectomy for T3N1M1 adenocarcinoma of the ascending colon. Sonographic evaluation of the right breast lump showed a hypoechoic mass with slightly irregular margins, but there was no internal vascularity. Chest CT also documented a poorly enhancing suspicious mass in the right breast. The diagnosis of adenocarcinoma metastasis to the breast was achieved with sonographically guided core biopsy.