ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Gynaecomastia. Magnetic resonance imaging (MRI) scan of a section through the chest of a 60-year-old male patient with gynaecomastia - the enlargement of breast tissue in males. This is usually due to high levels of the female hormone oestrogen in the blood. This can be caused by many medical conditions.
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