Very interesting. All I can make of this is that there are bone spurs at the L5-Sl joint and that encroaches the neural foramina. The neural foramina is the hole that the nerves pass thru to the spinal canal. I'm not understanding the "uncovering" of the disc. ??? But they might be suggesting that it's bulging, resulting in mild right to moderate left neural foraminal stenosis, which is narrowing of the foramen (the hole that the nerves pass thru.)
I hope this helps a little.
It would be best to talk to your doctor about this. Best of luck & let us know what happens. Hugs, Lee