Re: MRI clear? L5/S1 protrusion? MS related? HELP!!!
The way I understand it (from a history of spinal problems including surgery), a protrusion is one step away from a herniation. There isn't anything spilling out of the disk at L5/S1, but it is deformed and may be pressing on a nerve. If you get the full report, it will tell you what nerves the radiologist believe are involved. You can do a web search on dermatome maps to see where a nerve pinched at L5/S1 would be felt. This shouldn't have anything to do with MS, but may explain lower back pain if you're having it.
Spinal stenosis is a narrowing of the space where nerves run through your spine, and that can compress the cord and cause pain. It can be due to a herniation (or protrusion), but can also be due to arthritis of the spine, and increases with age. If the radiologist thought you had stenosis, he/she would have put that in the report as well.
Good luck finding out what's going on!