I have radiating gluteal, leg radiating pain and numbness, MRI shows left lateral lumbr disc protusion and degenrative discs, what is my diagnoses?

Sciatica. Pain in the distribution as you suggested describes the pattern of the nerve that travels in the leg called the sciatic nerve. The sciatic nerve is not the cause of the pain source, it is the result of an irritated nerve typically in the lumbar spine (low back) which are caused by herniated disks, spinal stenosis or degenerative disc disease requiring further evaluation by a spine specialist.