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Case Rep Oncol. 2011 Sep;4(3):521-5. doi: 10.1159/000334079. Epub 2011 Oct 21.

A malignant mass in the breast is not always breast cancer.

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  • 1Department of Clinical Oncology, University of Istanbul, Istanbul, Turkey.


A 37-year-old woman presented to the Internal Medicine Clinic with complaints of abdominal pain and constipation which had begun 3 months earlier. A colonoscopy was performed, and wall thickening of the sigmoid colon was detected. A biopsy of the sigmoid colon revealed a poorly differentiated, mucin-producing adenocarcinoma with a signet-ring pattern. No distant metastasis was detected. The patient was treated with chemotherapy consisting of 5-fluorouracil, leucovorin, and oxaliplatin. One and a half years later, a painless mass, which was not fixed to the skin, measuring 1 cm in diameter, was found in the lower outer quadrant of the left breast. A core biopsy of the mass was performed, and a histopathological report confirmed metastasis to the breast from mucinous adenocarcinoma of an intestinal primary.


Biopsy; Breast metastasis; Chemotherapy; Colon cancer

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