Re: Please help me understand my MRI
<< L4/L5: Diffuse annular bulging of the intervertebral disc. >>
You have a herniated L4-5 disk.
<< Left focal paramedian extrusion of the disc material, more prominent than on the previous examination. This measures 1.4 cm in width, .9 cm in depth, and 1.3 cm in height. >>
The extrusion is greater on the left side. 9mm of depth seems pretty big to me, but in the lumbar spine it may not be.
<< This results in mass effect upon the central and left anterior lateral aspect of the thecal sac and mild bilateral foraminal stenosis. >>
The material coming out of the herniated disk is pressing on the membrane surrounding the spinal canal (the thecal sac). On both sides, it is narrowing the foramina, the openings through which the nerves pass on their way down to your legs. He says the narrowing is "mild", though, so it shouldn't be affecting the nerves.