"There are many reported causes of damage to one side of the cord, including 1-7:"
"excessive motion (e.g. chiropractic manipulation 1, motor vehicle accidents)"
"iatrogenic (e.g. surgery)"
"compression (e.g. disc herniation, extramedullary collection)"
"distortion (e.g. ventral cord herniation)"
"demyelination (e.g. multiple sclerosis 7)"