A. A- Frontal sinus.
B. B- Ethmoid sinus.
C. C-Sphenoid sinus.
D. D- Maxillary sinus.
Ans:A. Frontal sinus.
Paranasal sinus which can be visualized best on a occipito-frontal view is Frontal sinus which is represented as “A” in the picture above.
Caldwell-Luc/ occipito-frontal view shows:
- Frontal sinus (Best visualization)
- Superior orbital fissure
- Superior marginof orbit and lamina papyracea
- Foramen rotundum
- Maxillary and ethmoid sinus.
Caldwell’s view (or Occipitofrontal view) is a radiographic view of skull, where X-ray plate is angled at 20° to orbitomeatal line.
The rays pass from behind the head and are perpendicular to radiographic plate. It is commonly used to get better view of FRONTAL SINUS.