please help me understand mri
 

we are new here. my husband was in a car accident about a year ago. was just given MRi results. he was diagnosed with a synovial cyst. workmans comp still hasnt approved his neuro surgeon. i need help understanding the results. here is the conclusion of the MRI lumbar spine

1)there is a mild left L4-5 facet arthrosis with an associated 1 cm posteriorly dissecting left facet synovial cyst noted.

2)there is a mild diffuse annular bulge at L5-S1 without nerve root displacement, central canal or foraminal stenosis.

3) there is a 3.2 cephalocaudal by 1.9cm in diameter Tarlov nerve root sleeve cyst or arachnoid cyst in the right side of the central canal begining at the mid body of S1 and extending to the inferior body of S2. This may be compressing the right S2 nerve root against the bony margins of the central canal.

And can you tell how long a synovial cyst has been there?

Hi. This is not the place for any sort of MRI explanation or diagnosis, or proper medical advice.
You would need to consult a trained medical professional.