Gastric Metastasis From Breast Infiltrating Ductal Carcinoma: A Case Report

Gastric metastasis from breast carcinoma occurs rarely and generally derives from infiltrating lobular carcinoma (ILC) rather than infiltrating ductal carcinoma (IDC). Here, we reported a case of breast infiltrating ductal carcinoma metastasis to stomach in a 58-year-old woman, who experienced epigastric pain and abdominal distention for ten days. Gastric endoscopy was performed and revealed erosion lesions in gastric body and antrum with the initial biopsies suggestive of a low-differentiated adenocarcinoma. During the work-up procedure, a 16x13 mm nodule in the lower outer quadrant of the left breast and multiple enlarged lymph nodes in the left axilla were detected by positron emission tomography-computed tomography (PET-CT). Review of immunohistochemical analysis of the previous pathological sections from the gastric biopsies confirmed that the gastric tumor derived from breast infiltrating carcinoma. The patient received chemotherapy and hormonal therapy without surgery. To date, the patient has survived for 20 months.