Corticosteroid therapy. Coloured X-ray of a patient receiving corticosteroid therapy to the lumbar (lower) spine. A needle can be seen between the second and third lumbar vertebrae (blocks). The needle is inserted into the epidural space, which is inside the spinal canal, but outside the membrane (dura mater) that surrounds the spinal cord. Corticosteroids are anti-inflammatory drugs used to treat conditions such as arthritis.
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