Spinal cord abscess is the swelling and irritation (inflammation) and the collection of infected material (pus) and germs in or around the spinal cord.| medlineplus.gov
Piriformis syndrome is pain and numbness in your buttocks and down the back of your leg. It occurs when the piriformis muscle in the buttocks presses on the sciatic nerve.| medlineplus.gov
An epidural steroid injection (ESI) is the delivery of powerful anti-inflammatory medicine directly into the space outside of the sac of fluid around your spinal cord. This area is called the epidural| medlineplus.gov
A tumor is an abnormal growth of body tissue. Tumors can be cancerous (malignant) or noncancerous (benign).| medlineplus.gov
Spondylolisthesis is a condition in which a bone (vertebra) in the spine moves forward, out of its proper position, in relation to the bone below it.| medlineplus.gov