hello doctor, actually for the past one and half years i have severe low back pain, lower abdominal pain, and thigh pain right more than left. i have got mri done of lumbar spine. it reports grade 1 anterolisthesis of L5 over S1. Diffuse disc bugle causing mild indentation of anterior thecal sac, bilateral neural foraminal narrowing with mild impingement of bilateral transversing nerve roots. L1-L2 19 mm, L2-L3 19 mm, L3-L4 20 mm, L4-L5 18 mm and L5-S1 17 mm. Please tell me what that means in simple words and would i have to undergo surgery for it or what to do now?