During a transvaginal ultrasound, you lie on your back on an exam table. You have a narrow device, shaped like a wand, inserted into your vagina. This device is called a transducer. The transducer uses sound waves to create images of your ovaries and other pelvic organs. A polycystic ovary has many fluid-filled sacs, called follicles. Each dark circle shown above is one follicle in an ovary.
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