<prompt> The most common site of the leak in CSF rhinorrhea is REPEAT QUESTIONSphenoid sinusFrontal sinusCribriform plateTegmen tympani  <response>: Leakage of CSF is most commonly seen in the anterior cranial fossa at the level of the cribriform plate as it is extremely thin. Ref: Diseases of nose ear and throat; Logan Turner; pg 28 