CSF rhinorrhoea occurs most commonly due to fracture of:
Tegmen tympani
Cribriform plate
Frontal sinus
Sphenoid sinus
(b) Cribriform plate(Ref. Cummings, 6th ed., 805)The most common site of traumatic CSF rhinorrhoea is fracture of lateral lamella of cribriform plate. The other mentioned site's fractures can also cause CSF rhinorrhoea/otorhinorrhoea.
Nose and PNS