Breast cancer is a common malignancy in women and metastasizes to the liver, the lung, the brain, and the bone, but metastasis to the colon is rare. We describe a 58-year-old woman with colon metastasis of breast cancer. She was diagnosed with right colon cancer, and during investigation for colon cancer, we found a breast cancer. She received a palliative right hemicolectomy due to obstruction before chemotherapy. The histology of the tissue taken from the right colon was shown to be the same as that of the left breast mass. This is a case of colonic metastasis from breast cancer and we report this case with a review of literature.
Brain ; Breast ; Breast Neoplasms ; Colon ; Colonic Neoplasms ; Female ; Humans ; Liver ; Lung ; Middle Aged ; Neoplasm Metastasis

A 31-year-old woman with a 5-year history of Crohn's disease was admitted to our hospital because of recurrent right lower quadrant pain and diarrhea. Abdominal computed tomography showed multiple fistulas between the terminal ileum, the sigmoid colon, and the cecum, and mucosal wall thickenings due to an active inflammatory process and mucosal enhancements. Colonoscopic examinations showed a finger-like projection of a polypoid mass at the ileocecal valve, long-neck, finger-like pseudopolyps at the cecum, and soft, lumen narrowing and multiple pseudopolyps at the sigmoid colon and the intact rectum. There was healing scarring of the anal fistula. These findings were compatible with those of Crohn's disease. Histologic findings were chronic inflammation with erosion and regenerative crypt epithelium. The patient underwent infliximab therapy. She underwent a right colectomy, a Hartman's procedure, and a small bowel segmental resection due to multiple fistulas. The pathologic diagnosis was a signet-ring-cell carcinoma with non-caseating granuloma in the ascending colon, ileum, and sigmoid colon. We report this case of Crohn's disease associated with a colonic signet-ring cell carcinoma.
Adult ; Cecum ; Cicatrix ; Colectomy ; Colon ; Colon, Ascending ; Colon, Sigmoid* ; Crohn Disease* ; Diagnosis ; Diarrhea ; Epithelium ; Female ; Fistula ; Granuloma ; Humans ; Ileocecal Valve ; Ileum ; Inflammation ; Infliximab ; Rectal Fistula ; Rectum