1. Introduction and history of polycycstic ovary syndrome Gab Kovacs; 2. Polycystic ovary syndrome: from henotype to genotype Joop Laven and Yvonne V. Louwers; 3. Epidemiology of polycystic ovary syndrome Larisa Suturina; 4. Ovarian ultrasonography in polycystic ovary syndrome Heidi Vanden Brink and Marla E. Lujan; 5. Classification of polycystic ovary syndrome informed by the International Guideline 2018 Robert J. Norman, Rhonda Garad and Helena Teede; 6. Relevance of anti-Müllerian hormone in polycystic ovary syndrome diagnosis and management Martina Capuzzo and Antonio La Marca; 7. Origins of polycystic ovary syndrome in utero Roy Homburg and Claudia J. Raperport; 8. Adrenal and polycystic ovary syndrome Ozlem Celik and Bülent Okan Yildiz; 9. Polycystic ovary syndrome and environmental toxins Eleni A Kandaraki and Olga Papalou; 10. Lifestyle in polycystic ovary syndrome Rhonda Garad, Siew Lim and Lisa J.Moran; 11. Ovulation induction in polycystic ovary syndrome Evert J.P. van Santbrink; 12. Ovarian surgery for ovulation induction Gab Kovacs; 13. IVF/ART in polycystic ovary syndrome Susie Jacob and Adam H. Balen; 14. Pregnancy complications and children outcomes in patients with polycystic ovary syndrome Femi Janse and Bart C. J. M. Fauser; 15. The role of in-vitro maturation in polycystic ovary syndrome Roger Hart and Melanie Walls; 16. Treatment of obesity in polycystic ovary syndrome Harry Frydenberg; 17. Mood disorders in polycystic ovary syndrome Anuja Dokras; 18. The long-term health consequences of polycystic ovary syndrome Lisa Owens and Stephen Franks; 19. Polycystic ovary syndrome: the patient's perspective Sabra Lane.