Question
My Lumbar spine MRI said:
The distal cord and conus are intact. Vertebral height and alighnment are normal. Marrow signal shows reactive degenerative marrow change in vetebral bodies about a degenerative L4-5 disc.
L3-L4: There is disc desiccation and mild loss of disc height. There is a diffuse annular bulge effacing inferior fat in each foramen, without nerve-root compression identified. There is no significant central canal narrowing and only slight effacement of the ventral thecal sac. There is a high T2 signal lesion, intermediate to low in T1 signal intensity, seen only on sagittal images, projecting at the pedicle region on the left at L3. This is round in shape and 1.1 cm in diameter. It is not associated with the foramina. L4-L5: There is significant loss of disc height, as described, with low T2 signal, consistent with underlying disc degeneration. There is diffuse annular bulge effacing inferior fat in each foramen, especially on the right with a shallow, far right broad protrusion as well. There is a very mild, multifactorial narrowing of the thecal sac in combination with facet and ligament hypertrophy. L5-S1: Broad-based, shallow, posterior spondylotic protrusion is seen without significant central stenosis. There is no nerve-root impingement seen in the foramina.

What does this mean?

Answer
L3-4- the disc is dried out (imagine your discs like grapes between your vertebrae, right?  this one is starting to turn raisin, is less able to act as an effective cushion between the bones).  Same thing with L4-5 disc

There are 2 things I don't know about in this description.  The first is the "marrow change"- unless you could be having effects of osteoporosis perhaps?  the other is the "T2 signal lesion"

I would ABSOLUTELY ask about these 2 points- the lesion especially.  If you cannot easily reach your doctor, there are websites where you can find out- try using Google and search for 'understanding my mri', or try posting  here:

http://www.healthboards.com/boards/forumdisplay.php?f=117

Someone should be able to tell you these things- ideally it would be your doctor since they know your specifics and can relate the nonsense description they give you to your actual symptoms.  

Good luck, and please write in again if I can help further-
leslie