A cerebrospinal fluid (CSF) leak is a condition in which cerebrospinal fluid leaks out of the brain or spinal cord. CSF is a clear, colorless fluid that bathes the brain and spinal cord and helps to protect them from injury. A CSF leak can occur as a result of a head injury, a spinal cord injury, or a birth defect.
Symptoms of a CSF leak can include headache, nausea, vomiting, dizziness, and neck pain. A CSF leak can also lead to serious complications, such as meningitis and encephalitis.