Metastatic Infiltrating Lobular Breast Cancer to the Colon Diagnosed Through Routine Bowel Screening in a 67-Year-Old Female.

Breast cancer most commonly metastasizes to the bone, lung, liver, and brain. The colon is an uncommon site for metastases and its symptoms are variable. A 67-year-old female with a history of breast cancer was referred for colonoscopy following a positive fecal occult blood test (FOBT); there were no discrete lesions concerning for primary colonic cancers or metastasis; however, a random biopsy revealed metastatic breast cancer. The possibility of colonic metastases must be considered when assessing positive FOBT in a patient with previous breast cancer.