Help with MRI report

Findings: Grade 1 anterrolisthesis of L4 in relation to L5 is noted. Upper lumbar alignment is perserved. There is no evidence of acute compression fracture. The conus medullaris terminates at the L1-2 level, and is unremarkable.
At L4-5, a broad right subarticular and foraminal disk pretrusion with associated anterolisthesis contributes to severe right foraminal stenosis and likely mass effect upon the exiting right L4 nerve root.
At L4-5-S1, a mild broad central disk protrusion is present without compressive sequelae. The other disk levels are preserved. There is no evidence of transiting nerve root impingement.
The visualized sacroiliac joints are unremarkable.
The paraspinal soft tissues are preserved.

[Kalvin]

Anterolisthesis  is when the upper vertebral slips forward on the one below. So your L4 is slipping slightly forward over L5. Grade 1 is a mild slippage.

The other thing worth noting on this report is the severe foraminal stenosis and likely effect on the L4 nerve. Do you have pain from your rear, down the thigh to the front of the knee and shin?