A Unique Endoscopic Presentation of Colon Metastases From Primary Invasive Lobular Carcinoma of the Breast

Breast cancer is the leading cause of female malignancy-associated death worldwide. The most common sites of metastases are the lung, liver, brain, and skeleton. A 68-year-old female with invasive lobular carcinoma metastatic to the axial skeleton was found to have new skin and colonic metastases discovered on serial surveillance positron emission tomography-computed tomography scans. The colonic metastases did not present with any gastrointestinal symptoms and did not form exophytic masses, which are typically associated. Instead, her colonic metastases presented as unusual diaphragm-like strictures within the left colon discovered on endoscopy, which is a relatively rare phenomenon. This case raises awareness of and elucidates new manners of presentation of metastatic invasive lobular carcinoma within the colon.