Ankylosing spondylitis (AS) is a form of chronic, inflammatory arthritis of the spine, which is caused by overactive immune system response and genetic predisposition. It can cause lasting damage to the vertebrae and other joints in the body, such as the hips and shoulders.
In general, ankylosing spondylitis does not show up on a CT scan. This is because CT scans are typically used to diagnose bone and joint conditions, and ankylosing spondylitis is a soft tissue condition that causes inflammation and irritation of the joints and surrounding tissues. However, there are some cases in which a CT scan can be used to monitor changes in the spine that may be caused by ankylosing spondylitis.
For example, a CT scan can be used to detect changes in the vertebrae that occur due to ankylosing spondylitis, such as the formation of bony bridges between the vertebrae (called syndesmophytes) or the presence of calcium deposits in the vertebrae. These changes can be seen in advanced cases of the condition and can be used to track the progression of the disease over time.
In addition, a CT scan can also be used to detect changes in the soft tissues of the spine that can occur due to ankylosing spondylitis, such as inflammation and irritation of the ligaments and tendons.
Overall, ankylosing spondylitis does not typically show up on a CT scan, but in certain cases, a CT scan can be used to monitor changes in the spine that may be caused by the condition. It is important to speak to your doctor to determine if a CT scan is necessary for your particular case.