For tethered cord, they can do a MRI of
spine, but it does not always show on a MRI
so there r other ways to help determine TCS- a urodynamics test of the bladder, looking to see if u have a sacral dimple, or hairy patch, even an elongated brain stem can indicate TCS.
A CINE MRI helps look at CSF flow so it is also known as a flow study.
but a MRI of the thoracic and lumbar spine should be done to rule out syringomyelia as it can form in ne area of the spine.