Ovarian cysts are usually benign or malignant tumors that occur on the ovaries. How to distinguish benign tumors? Benign tumors are relatively small, mostly asymptomatic, and are usually found by chance during gynecological examination, and when they increase in size, there will be abdominal distension or a lump can be felt during abdominal examination. Usually, benign tumors have a longer course and grow gradually, and are mostly unilateral, movable, cystic, and smooth on the surface. Usually there is no fluid in the abdominal cavity, and all the signs and symptoms are good. Ultrasound is usually a dark area of fluid, which may have intervening bands of light in the center and clear margins.