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Sacroiliitis. Colored gamma camera scans taken from the front (left) and back showing sacroiliitis, inflammation (black) of the sacroiliac joints. These are the joints formed by the sacrum of the spine and the ilia of the pelvis. The inflamed joints can be seen above the bladder (black oval) in the scan at right. In this case, the underlying cause is arthritis, and other areas of inflammation can be seen. The low back pain of sacroiliitis is treated by rest and anti- inflammatory painkillers. Gamma camera, or radio nuclide, scans are produced from the radiation released by radioactive isotopes introduced into the body. (KEYSTONE/SCIENCE PHOTO/Leonard Lessin) === ===