For many nothing. 90% of congenital type which affects 6% of population are treated non op with 50% not ever having any symptoms & the others treated when needed with exercise, back support & medication. It can be associated with scoliosis. The degenerative/acquired type is treated 70% non op the same way & can be associated with spinal stenosis as well. Both types can lead to back &/or leg pain with Neuro symptom.
Bavk acje siatica. L5nerve root impingment bacj ache are commonly they commonly asymptomatic and found incidentally.