Cerebrospinal fluid (CSF) is a pure, colorless body fluid found in the brain and spinal cord. Cerebrospinal fluid has three main functions: It protects brain and spinal cord from trauma, deliveries nutrients to nervous system tissue, removes waste products from cerebral metabolism. CSF leaks occur through a communication between the facing of the brain and the nose. These communications may occur spontaneously or result from trauma or earlier sinonasal surgery. Complications may occur if the cause is surgery or trauma. Infections after surgery or trauma can lead to meningitis and serious complications, such as swelling of the brain. Maximum CSF leaks are a complication of a spinal tap or surgery.