Primary care doctors, gynecologists, and even patients too often view endometriosis as a reproduction-related illness that warrants treatment primarily when someone wants to conceive, says Megan Wasson, a minimally invasive gynecologic surgeon (MIGS) at the Mayo Clinic in Phoenix, who treats endometriosis patients. But in the operating room, she has removed endometrial lesions from the lungs, bowels, spleen, and even the pericardial sac surrounding the heart.