In halo sign seen in csf rhinorrhea:
CSF rhinorrhea seen in
Lefort 2&3
Naso orbital ethmoid fracture.
Cribiform plate fracture.
Frontal sinus fracture.
Sphenoidal sinus fracture
Blood is encircled with csf.
CSF is encircled with blood.
Both are mixed no demarcation.
None of the above.