Question

Water's view is used to obtain diagnostic information of:

• A. Maxillary sinus
• B. Ethmoidal sinuses
• C. Frontal sinus
• D. Sphenoid sinus

Hint:

Occipitomental 45 degree view clears the petrous bones off the antra.

Answer 1

The Correct Option is A

Step 1: Sinus radiographs are named by how the beam is angled, and each angle best displays a particular sinus group.
Step 2: In the Waters' (occipitomental) projection the chin is raised so the orbitomeatal line sits at about $45^\circ$ to the beam. This positioning throws the dense petrous temporal bones downward and out of the way.
Step 3: With the petrous shadows removed, the maxillary antra become clearly visible, making this the view of choice for assessing the maxillary sinuses for fluid, opacification or fractures.
Step 4: The frontal and ethmoidal air cells need the Caldwell view, and the sphenoid needs lateral or basal views, so they are not the answer here.
\[\boxed{\text{Maxillary sinus}}\]