Since the first edition of the book “Gynecologic and Obstetric Pathology” was published in July 2019, the knowledge base of gynecologic and obstetric pathology advances very rapidly, especially in the areas of ancillary testing and classification of tumors. In addition, the publication of the WHO classification of Tumors of the Female Genital tract in 2020 introduced many changes in terminology, new variants of tumors and ancillary testing schema with several older entities were reclassified into other families of tumors, leading to diagnostic terminology that should no longer be utilized. Furthermore, multiple new entities and better diagnostic approaches have been recognized after the publication of WHO2020. In order to keep pace with these changes, this text must be updated to the new, worldwide standards in terminology to assure that it remains an authoritative text for gynecologic and obstetric pathology. This updated edition represents the most up to date, comprehensive text in this field, and a new edition will assure that this remains the case. Written by an international panel of well recognized, authoritative pathologists from numerous countries, it will be a helpful reference for practicing pathologists, pathology residents, gynecologic pathology and oncology fellows, clinicians, healthcare providers, and biomedical researchers and is intended for use as a bench or scope side reference, resource for studying for board examinations or to satisfy any interest in certain topics within the field of gynecologic pathology.