Clinically accessible information for pathologists on histology, molecular pathology, differential diagnosis, and clinical overview is presented. Common and rare entities are covered with an abundance of images to highight key features.Topics for pathologists covering the fast moving field of breast pathology include: Less common variants and mimics of DCIS; Invasive lobular carcinoma and its variants; Important inflammatory and reactive lesions; Small glandular proliferations; Vascular lesions of the breast; Combined epithelial-myoepithelial lesion; Immunhistochemical pitfalls in the diagnosis of breast lesions; Pathology considerations in patients treated with neoadjuvant chemotherapy; Molecular classification of breast cancer: Jorge Reis-Filho; Prognostic factors for patients with breast cancer: Traditional and New