<prompt> CSF rhinorrhoea occurs most commonly due to fracture of:Tegmen tympaniCribriform plateFrontal sinusSphenoid sinus  <response>: b Cribriform plateRef. Cummings, 6th ed., 805The most common site of traumatic CSF rhinorrhoea is fracture of lateral lamella of cribriform plate. The other mentioned sites fractures can also cause CSF rhinorrhoeaotorhinorrhoea. 