A CSF leak occurs when the fluid escapes through a tear or hole in the dura mater – the tough, outermost layer of the meninges that surrounds the brain and spinal cord. The dura can be damaged ...
A CSF leak is when CSF drains from a tear or hole in the membrane that surrounds the brain and spinal cord. The resulting drainage can escape from a person's nose—appearing just like a runny nose.