|Image by Patrick Lynch from Wikipedia|
An interesting trivia related to CSF leaks is that actor George Clooney suffered one after a blow to the head while filming a torture scene in the 2005 movie "Syriana".
Diagnosis can be obtained simply by taking some of this nasal drainage into a red-top tube and getting it tested for beta2-transferrin which is a protein found in brain fluid, but not in normal nasal secretions.
The take-home message is that not all runny noses are due to allergies, especially if it is continuous and only occurs on one side.
Of note, the Washington Post also published a similar story of a different patient with the same problem in 2010.
Woman's running nose revealed to be leaking brain fluid. Fox News 12/3/12.