Breast masses are broadly classified as benign or malignant. Common causes of a benign breast mass include fibrocystic disease, fibroadenoma (see the image below), intraductal papilloma, and abscess. Malignant breast disease encompasses many histologic types that include, but are not limited to, infiltrating ductal or lobular carcinoma, in situ ductal or lobular carcinoma, and inflammatory carcinoma. The main concern of many women presenting with a breast mass is the likelihood of cancer. Reassuringly