<prompt> The common site for CSF rhinorrhoea isSphenoid sinusFrontal sinusPetrousCribriform plate  <response>: The cribriform plate and air cells of the ethmoid sinus account for a maximum number of CSF leaks, i.e., through anterior cranial fossa. Other sites are frontal sinus, an area of sella turcica and sphenoid sinus. Rare sites of the leak are middle or posterior cranial fossa and CSF and reach the nasal cavity by way of the middle ear and Eustachian tubeTraumatic leak-Cribriform plate and ethmoidal air cellsSpontaneous non-traumatic leak -Cribriform plateRef: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 183 - 185 