Replying to @CindyM MRI technologists teach me! Ive learned 5% of people have fatty filum terminale most of which are asymptomatic but some have tethered cord syndrome (more common in hypermobile ehlers danlos syndrome) Where the spinal cord is abnormally stretched or tethered due to the filum terminale being too thick causing lower back pain, weakness or numbness in the legs and bladder or bowel dysfunction.

fMRI (Functional MRI)

Conus Medullaris Syndrome

Spinal Nerves