What is Thoracic Endometriosis Endometriosis usually involves the pelvis, especially the ovaries, cul-de-sac, broad lines, and uterosacral muscles. However, endometrial tissue can be found without skin on the abdomen, chest, brain, and skin. Thoracic involvement is the most common area of pelvic endometriosis. The pathogenesis, epidemiology, and pathology of thoracic endometriosis will be reviewed here. […]