Breast cancer remains the leading cause of cancer in women, which makes accurate diagnoses on core needle biopsy (CNB) specimens of vital importance in staging and guiding therapy decisions for patients. The first edition of this multi-authored text written by leaders in the field from major academic medical centers provided a comprehensive guide on diagnostic breast pathology in the core biopsy setting. In addition to in-depth coverage of benign and malignant entities encountered in breast core biopsies, the book provided additional resources to improve diagnostic accuracy such as pattern-based approaches to evaluation, mimickers of breast lesions arising in extra-mammary sites, and pitfalls specific to small tissue samples.