Less then a cm lesion on spinal cord can't walk or write. ms or tumor? how dangerous is it for bx on signal cord? could it be benign?

Hard call: You have my sympathy. It is often difficult to tell ms / devic's from a tumor just on scan. A neurosurgeon knows how to biopsy and when not to. Get to a subspecialty center, and good luck.

Suggestions: A small solitary lesion in the spine is unlikely to be ms unless there are also lesions in the brain. Although tumor could be considered, a small vascular malformation or other types of problems may be the culprit. Not clear whether your lesion is positioned to cause your disability. You do need an experienced neurosurgeon to help manage this, and perhaps other doctors will need to get involved.