This updated fascicle is your essential guide to thyroid and parathyroid tumors, reflecting a decade of significant advancements. It adopts the 5th edition of the WHO classification, offering detailed histologic findings with a strong emphasis on differential diagnosis. You’ll find comprehensive explanations of molecular pathology and genetic alterations, with sections on molecular profiles in each chapter dedicated to a histologic thyroid or parathyroid entity to aid diagnosis. The thyroid cytology chapter has been extensively remodeled and expanded given the importance of preoperative diagnosis in the management of thyroid nodules and now follows the current Bethesda System for Reporting Thyroid Cytopathology. Plus, all chapters include the latest on prognosis and therapy, based on guidelines from the American Thyroid Association and National Comprehensive Cancer Network. Designed to empower pathologists and other physicians, this fascicle helps you better understand, diagnose, predict the behavior of, and guide the management of patients afflicted with tumors and related lesions of these organs.