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Purpose. Cerebrospinal fluid is a clear liquid produced within spaces in the brain called ventricles. Like saliva it is a filtrate of blood. It is also found inside the subarachnoid space of the meninges which surrounds both the brain and the spinal chord.erebrospinal fluid is a clear liquid produced within spaces in the brain called ventricles. Like saliva it is a filtrate of blood. It is also found inside the subarachnoid space of the meninges which surrounds both the brain and the spinal chord.
At the Yale Sinus and Allergy Program, we are specialists in treating cerebrospinal fluid leaks and the symptoms associated with them. Cerebrospinal fluid is a clear, colorless fluid that surrounds the spinal cord and brain.t the Yale Sinus and Allergy Program, we are specialists in treating cerebrospinal fluid leaks and the symptoms associated with them. Cerebrospinal fluid is a clear, colorless fluid that surrounds the spinal cord and brain.