MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
X-ray diagnosis. Doctor making a diagnosis from an X-ray of hands. The patient has the autoimmune disease rheumatoid arthritis, which causes the joints to become inflamed. An X-ray image is created by passing electromagnetic X-rays waves through the body and onto film. X-rays penetrate soft tissue but are absorbed by bones.
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