The septated many many segments. The septated ovarian cyst means, you have an ovarian cysts which is has many segments and each segment is separated by wall (Septa). If the walls or Septa are thick then there is risk of cancer. So hysterectomy/oophorectomy is indicated. After the hysterectomy, they will evaluate the malignancy. For more details, visit Ovarian Cancer.
It sounds as if your ovary has some really serious infection. At this point the Doctor may choose to remove the ovary. It will leave your tubes, one ovary and the uterus in the event you choose to bare a child.