Book excerpt: Now in a revised and expanded third edition, this case-based guide emphasizes the latest investigative advances in both imaging and molecular diagnostics and new treatment approaches for a wide variety of common and complex endocrine conditions. Utilizing unique clinical case histories, each main endocrine condition and disorder is curated by a senior Section Editor with an introduction to his or her area covering both physiology and pathophysiology. This introductory chapter is followed by a number of case histories written by invited experts and designed to cover the important relevant pathophysiology, following a consistent chapter format for ease of use, including bulleted objectives, case presentations, review of the diagnosis, lessons learned, and 3-5 multiple-choice review questions. Section headings include the pituitary, thyroid (overactivity, underactivity and cancer) and parathyroid, adrenal disorders, metabolic bone disease, type 2 diabetes, lipid abnormalities, obesity, and pregnancy. Topics new to this edition include PCOS, transgender medicine and the endocrine effects of viral infections. With a focus on covering major parts of the APDEM curriculum, A Case-Based Guide to Clinical Endocrinology remains a tremendous resource for junior and veteran clinicians alike.