MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Ultrasound breast scan. Female doctor carrying out an ultrasound breast scan. Ultrasound scans are produced using high-frequency sound waves from a hand-held transducer. The waves reflect back to the transducer off internal body structures and are formed into the real-time image seen on the monitor at far left. Ultrasound breast scans are used to distinguish between solid tumours and fluid-filled cysts. They are normally carried out once a mammogram (breast X-ray) has revealed an abnormality. With a tumour, a biopsy (tissue sampling) must be carried out to see whether it is cancerous. Photographed at the European Institute of Oncology in Milan, Italy.
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