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Diseases that fall under spondyloarthritis umbrella are ankylosing spondylitis , reactive arthritis (known previously as Reiter's syndrome) psoriatic arthritis and psoriatic spondylitis, and the arthritis or spondylitis associated with the inflammatory bowel diseases, ulcerative colitis and Crohn's disease . Still other patients may develop undifferentiated spondyloarthritis. This means they have symptoms or signs of one of the illnesses above, but don't develop the full blown disease. The disease most frequently begins between ages 20 and 40, but may begin before age 10. It affects more males than females. Risk factors include a family history of ankylosing spondylitis and male gender. Symptoms of Spondyloarthris The disease starts with hip or low back pain that comes and goes and is worse at night, in the morning, or after inactivity. Back pain may begin in the sacroiliac joints (between the pelvis and the spine) and involve all or part of the spine. Pain may go aw...
Magnetic resonance imaging (MRI) of the spine is a noninvasive procedure that uses powerful magnets and radio waves to create pictures of the spine area, including the vertebrae (spine bones), the spinal cord, and the spaces between the vertebrae through which the nerves travel.
See also: MRI
Magnetic resonance imaging - spine; Nuclear magnetic resonance - spine; MRI of the spine; NMR - spine
How the test is performed
You will be asked to lie on a narrow table, which slides into a large tunnel-like tube. The health care provider may inject a dye through one of your veins. This helps certain diseases and organs show up better on the images.
Unlike and computed tomographic (CT) scans, MRI does not use radiation. Instead, it uses powerful magnets and radiowaves. The magnetic field produced by an MRI forces certain atoms in your body to line up in a certain way. It's similar to how the needle on a compass moves ...
A lumbosacral spine CT is a computed tomography scan of the lower spine and surrounding tissues.
Spinal CT; CT - lumbosacral spine
How the test is performed
You will be asked to lie on a narrow table that slides into the center of the CT scanner. You will need to lie on your back for this test.
Once inside the scanner, the machine's x-ray beam rotates around you. (Modern "spiral" scanners can perform the exam in one continuous motion.)
Small detectors inside the scanner measure the amount of x-rays that make it through the part of the body being studied. A computer takes this information and uses it to create several individual images, called slices. These images can be stored, viewed on a monitor, or printed on film. Three-dimensional models of organs can be created by stacking the individual slices together.
You must be still during the exam, because movement causes blurred images. You may be told to hold your br...
You should know
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