My dr decided that i needed a mri of my back and here are the findings and i understand most of it but not all.

Minnimal bulging. Degenerative disc disease noted at L4-L5 and L5-S1.

I understnd it all but the S1.

I know that L=lumbar
and i know that cspine is the cervical spine/ the neck.

but i do not understand what the S stands for.

thanks for any information that you can give me.


sharon