The most common site of leak in CSF rhinorrhoea is -: (A) Sphenoid sinus, (B) Frontal sinus, (C) Cribriform plate, (D) Tegmen typmani
Answer is C. 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)