Intracranial hypotension
CSF leak is an escape of the fluid that surrounds the brain and spinal cord.
The dura is the membrane that surrounds the brain and spinal cord and contains the cerebrospinal fluid (CSF). A tear in the dura may occur without cause, after certain head, brain, or spinal surgeries, or after a head injury.
CSF leak can also be caused by a lumbar puncture (spinal tap) or by placement of tubes used for epidural anesthesia or pain medications.