The most common site of leak in CSF rhinorrhoea is:: (A) Sphenoid sinus, (B) Frontal sinus, (C) Cribriform plate, (D) Tegmen tympani
Answer is C. CSF rhinorrhoea is most commonly iatrogenic, following endoscopic sinus surgery. It can occur in surgery of frontal, sphenoid or ethmoid sinus. Injury to cribriform plate and ethmoid roof is the most common cause.