Question

Caldwell's view is used for:

• A. Maxillary sinus
• B. Frontal sinus
• C. Ethmoidal sinus
• D. All of the above

Hint:

Occipitofrontal 20 degree view best shows the frontal sinus.

Answer 1

The Correct Option is B

Step 1: Each named sinus projection is defined by its beam angle, and the Caldwell uses a $20^\circ$ caudal tilt of the beam to the orbitomeatal line in an occipitofrontal direction.
Step 2: With this modest tilt the petrous bones are thrown down to the level of the inferior orbital rim, opening up the upper face on the film.
Step 3: The result is a clear display of the frontal sinuses, which is the chief purpose of this view, with the ethmoid cells visible as well.
Step 4: Because the maxillary antra need the Waters' projection, the best single answer for Caldwell's view is the frontal sinus.
\[\boxed{\text{Frontal sinus}}\]