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CSF rhinorrhea is caused by a small tear or hole in the membrane surrounding the brain. It can result from a severe head injury, complications from surgery or high pressure in the skull (intracranial pressure).

Because the brain produces roughly 17 ounces (500 milliliters) of cerebrospinal fluid each day, a runny nose caused by CSF rhinorrhea can be a seemingly endless problem.

And because a runny nose is such an ordinary complaint, most people ignore CSF rhinorrhea at first.
http://news.yahoo.com/runny-nose-could-leaking-brain-fluid-164229313.html