Cerebrospinal fluid (CSF) surrounds and protects your brain and spinal cord. It’s held in place by a layer called the dura mater. A hole or a tear in the dura mater can lead to a CSF leak.

CSF leaks were originally thought to be relatively rare, with an estimated annual incidence of 5 per 100,000 people. ... such as brain tumors or blood clots in the brain.

Dear W.M.: CSF surrounds and supports the brain and spinal cord. The meninges normally form a fluid-proof barrier, but if the outer layer of the meninges (the dura mater) is damaged, CSF can leak out.

CSF leaks were originally thought to be relatively rare, with an estimated annual incidence of 5 per 100,000 people. ... such as brain tumors or blood clots in the brain.

The doctors followed the CT scan with an MRI of the patient's spine. The MRI revealed pools of cerebrospinal fluid (CSF), the clear fluid that typically surrounds the brain and spinal cord; the ...