Pathogenesis Implantation Theory Retrograde Menstration Theory Sampson, 1921 Lymphatic and vascular dissemination Theory Javert, 1952 · Coelomic Theory Meyer Genetic Theory Immune System Dysfunction (immunologic theory 2003-11-32003-11-3 5 Pathogenesis: • Implantation Theory Retrograde Menustration Theory Sampson，1921 • Lymphatic and Vascular Dissemination Theory Javert，1952 • Coelomic Theory Meyer • Genetic Theory • Immune System Dysfunction（immunologic theory）