Managed. Cured might be a stretch. It can be surgicaly treated and removed, and medically managed. With treatment, the symptoms can be minimized or eliminated.
Controversial. Proper surgical resection of endometriosis, which requires an expert surgeon with specialized training, can go a long way towards ongoing relief from endometriosis. I believe (based on good data and theory) that the disease can be permanently removed. That does not mean, however, that the pain that results may not linger at least somewhat. Pain is a lot more than just some inflamed tissue.
No. Can be treated and managed.