Description: In this module, we begin with a discussion of breast cancer risk factors, facts, and classification. The first section covers the sonographic and mammographic features of non-invasive breast cancers such as lobular carcinoma in situ (LCIS), ductal carcinoma in situ (DCIS), and Paget’s disease. Following is a review of invasive carcinomas such as invasive ductal carcinoma (NOS), invasive lobular carcinoma (ILC), as well as tubular, medullary, mucinous, and papillary carcinomas. Other breast neoplasms are covered including Phyllodes tumor, lymphoma, and multicentric disease. The module concludes with a review of inflammatory carcinoma, metastatic disease, staging, and tumor recurrence. Core Concepts: 90 min Focus Session: 70 min CME 1.75 SDMS CME