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What causes thoracic lesions?

I'm 30 and I was diagnosed with MS over 8 years ago. I've been blessed with relatively few complications, but during a recent scan of my spine, my doctor found a 'thoracic lesion.' She didn't seem too concerned, but I don't understand why. What is this lesion and is it dangerous?
I'm sorry to hear that your physician was not able to sufficiently explain your test results. To start at the beginning, multiple sclerosis is an immune disease. It targets the sheath that surrounds nerves in your body. You can think of the sheath like the insulation of electrical wiring. Without it, nerve impulses are not conducted properly, and you can temporarily (or permanently) lose motor or sensory abilities. It is classically defined by multiple immune attacks separated in space and time, meaning they happen to different nerves in distinct episodes. Doctors become concerned when lesions (meaning sites of immune attack against the insulation) crop up quickly, or cause concerning symptoms. Frequently, we find lesions in unexpected locations that have no clinical consequence, meaning they are not appearing quickly and they do not result in any symptoms. This can be the case either because they happened to hit a nerve you weren't using, or the body has already compensated for the attack, and you may or may not have ever noticed symptoms at all. In this case, the lesion was in the thoracic part of your spinal cord (meaning the part of your cord at the level where you have a rib cage). To summarize, this lesion is a site of immune attack against your nervous system characteristic of your MS, but it probably has not caused any symptoms and has not changed your physician's thinking about your disease. However, a more thorough explanation should be available from your doctor, and you should ask for clarification at your next visit.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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