How are an ovarian cyst and ovarian cancer different?

Benign&Malignant. Ovarian cysts are benign fluid filled sacs in the ovaries.Some custs can become cancerous ovarian cancer is a malignant tumor of ovaries and is a serious condition often with poor prognosis requiring surgery, chemotherapy and sometime radiation therapy.
See below. Most ovarian cyst are benign. They usually come from normal ovarian follicles. Other benign cysts are dermoid cyst, cystadenoma (benign cystic neoplasm) or endometrioma. Ovarian cancer is a malignancy. Imaging studies cannot always tell them apart and surgery may be needed.