The cure for an ectopic pregnancy... are doses of Methotrexate. Barring contraindications for chemotherapy agents it's not really extremely complicated. The extremely complicated and dangerous part comes when the fetus has grown to such size that it is impeding and threatening the blood vessels around it, some of them major blood vessels of the body. At which point the surgical removal of which without causing an exsanguination of the woman I would rate - as a layman - as complicated as operating on an aortic aneurysm.