Trying to understand MRI results of severe central canal and bilateral foramnal stenosisat L3-L4 and L2-L3 with compression of caudal nerve roots?

HNP &/or bony spurs. Central spinal canal stenosis and/or neural foramina stenosis is usually due to disc herniation or bulge, degenerative bony hypertrophic changes, congenital spinal stenosis or any combination of these factors. Trauma and Tumors would be special cases. You do not say what is producing the encroachment. Bony changes come with age, wear and tear. Disc disease can occur at any age. .