Mild bilateral foraminal stenosis at L4 - 5?

A foramen is a hole.  Stenosis is a narrowing of that hole.  Your spine is made up of bones called vertebrae that are named by their region (cervical, thoracic, & lumbar - C, T, & L) & the number from the top.  L4 & L5 are the 4th & 5th lumbar vertebrae, & they are the lowest vertebrae in the spine.  L4 & L5 come together and form a hole on each side (right and left) that is called a neural foramen.  Out of that neural foramen comes your right and left L4 nerve.  If there is foraminal stenosis at the bilateral L4-5 foramina, then you may be encroaching upon or pinching those right and left L4 nerves.