BSIP, VEM / SCIENCE PHOTO LIBRARY BSIP, VEM / SCIENCE PHOTO LIBRARY
Ovarian cyst, coloured ultrasound scan. Cysts are abnormal liquid-filled sacs. Since fluid does not reflect sound waves, the cyst (lower left) appears dark. An ovarian cyst is not usually malignant, but may reach a large size and place pressure on surrounding organs. Severe pain may result, and surgical removal may be required. Ultrasound scans use reflections of high-frequency sound waves to build up an image of internal body organs.
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