Which projection would best demonstrate the frontal sinus?

The Waters projection, also known as the occipitomental projection, is specifically designed to visualize the frontal and maxillary sinuses effectively. This projection allows for a clear view of the frontal sinuses by placing the orbits perpendicular to the film, which elevates the frontal sinuses above the orbits. The configuration of the beam and the positioning reduces superimposition from the facial structures, making it ideal for identifying any pathology or anatomical details within the frontal sinus region.

While other projections provide valuable information about the skull and sinuses, they may not highlight the frontal sinus as effectively. The lateral projection gives a good overview of the overall skull and some sinuses but is less specialized. The AP axial projection, commonly used for the occipital bone, does not provide optimal viewing of the frontal sinus anatomy. The submentovertex projection focuses more on the base of the skull and the condyles and is less effective for frontal sinus visualization. Thus, the Waters projection is the most suitable for demonstrating the frontal sinus.