ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY
Mediastinal teratoma. Frontal chest X-ray of the heart and lungs of a 10-year-old boy, showing a large (voluminous) teratoma in the mediastinum, the central part of the chest cavity between the lungs. A teratoma is form of cancer that arises from germ cells, in this case germ cells found in the lungs. Germ cell cancers usually arise in the testes or ovaries, but can also arise along the midline of the body, in this case in the mediastinum. The teratoma is seen as a mass adjacent to the heart, and protruding into the lung cavities either side.
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