Essential Components of a Successful Breast Core Needle Biopsy Program: Imaging Modalities, Sampling Techniques, Specimen Processing, Radiologic/Pathologic Correlation, and Appropriate Follow-Up.- Pattern Based Evaluation of Breast Core Needle Biopsies.- Multiples in Core Biopsy Samples.- Inflammatory, Reactive, and Infectious Conditions of the Breast.- Adenosis, Sclerosing Lesions, Microglandular Adenosis and Mucocele-Like Lesions.- Papillary and Adenomyoepithelial Tumors.- Fibroepithelial Lesions in Women, Adolescents/Children and Males.- The Spectrum of Columnar Cell Lesions.- Intra-Ductal Proliferations (DCIS, ADH and UDH).- Invasive Ductal Carcinoma Including Microinvasive Carcinoma, Tubular Carcinoma and Cribriform Carcinoma.- Triple Negative/Basal-like Breast Carcinomas.- Less Common Triple Negative Breast Cancer.- Special Histologic Types of Breast Cancer: Mucinous, Secretory, Micropapillary, Neuroendocrine, Cystic Hypersecretory, Glycogen-Rich Clear Cell, and Carcinoma with Osteoclast-Like Giant Cells.- Atypical Lobular Hyperplasia and Lobular Carcinoma In Situ Helena Hwang and Sunati Sahoo.- Invasive Lobular Carcinoma.- Benign and Malignant Mesenchymal Tumors.- Vascular Lesions of the Breast.- Breast Tumors in Adolescents/Children and Males.- Lesions of the Nipple.- Lymphoid and Hematopoietic Tumors of the Breast.- Special Clinical Settings: Tumors Arising in Pregnancy, Pregnancy-Like (Pseudolactational) Proliferations, Breast Carcinoma in the Pre-Neoadjuvant Chemotherapy Setting, Recurrent Breast Carcinoma, Inflammatory Breast Carcinoma.- Current Standard Clinical Predictive Markers.- Future Role of Molecular Profiling in Small Breast Samples and Personalized Medicine.- Metastases to the Breast.- Dermatologic Mimickers of Breast Lesions Arising in the Breast Skin, Subcutis or Axilla.