Unusual Cause of Intestinal Obstruction: Lobular Carcinoma of the Breast with Ileal Metastasis

Breast cancer is the most common malignancy diagnosed in women worldwide. Metastatic spreading disease to the gastrointestinal tract is very rare. Common sites of invasive ductal carcinoma metastasis are the liver, lungs and bones, whereas invasive lobular carcinoma more readily metastasizes to the peritoneum, retroperitoneum and the genitourinary system, in addition to the gastrointestinal tract. Lobular carcinoma, representing only 10% of breast cancers is more likely to metastasize to the gastrointestinal tract. In this case report, we describe a case of small bowel obstruction in our hospital, which was diagnosed as metastatic adenocarcinoma of the small intestine caused by primary invasive lobular breast cancer.