<prompt> The most common site for CSF rhinorrhoea is -Ethmoidal sinusesMaxillary sinusesFrontal sinusTegmen tympani  <response>: The most common site of traumatic CSF rhinorrhoea is the fracture of that pa of the cribriform plate which forms the roof of the ethmoid sinus. Ref: Cummings, 6th edition, pg no. 804 