MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Bone scanning. Rheumatoid arthritis patient lying under a bone densitometry X-ray scanner. X-rays passed through the body measure bone density. Rheumatoid arthritis is an autoimmune disorder caused by the attack of the immune system on body tissues. This results in the inflammation and, in severe cases, deformation of the joints.
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