MRI what does it mean, mild bdoad based disc herniation extending about 3.9mm posteriorly, indenting the anterior aspect of the thecAl sac. No centrl canal stenosis or nerve root displacement. coupled with hyper trophic degenerative facet change, there is some lateral recess narrowing, right greatr than left. mild left neural foraminal narrowing, secondary to bulging disc and facet degeneration and mild to moderate medial neural foraminal narrowing on the right. apperance similiar.also, there is an approximate 6mm meningeal cyst associated with right sacral s2-s3 nerve roots behind the second sacral segment, unchanged. WHAT DOES THIS MEAN?