Breast metastases in advanced rectal cancer: a case report.

Breast metastasis from solid tumors rarely occurs, although primary breast cancer is one of the most common malignancies in women worldwide. Rectal cancer metastasis is rarely reported. We report a case of a 49-year-old Chinese woman with advanced rectal cancer, who presented with mass in her left breast and several irregular dusky-red nodular knurls in the skin around the left nipple. Based on percutaneous echo-guided biopsy of the breast lesion, a poorly differentiated adenocarcinoma was consistent with rectal cancer metastasis histologically and immunohistochemically. This should be considered in any patient with history of cancer and confirmed histologically and immunohistochemically.