Which radiographic projection of the cranium best demonstrates the maxillary sinuses?

The parietoacanthial projection, commonly known as the Water method, is specifically designed to clearly visualize the maxillary sinuses. This projection positions the patient's orbitomeatal line (OML) at approximately a 37-degree angle to the film, which optimally demonstrates the maxillary sinuses, allowing them to be projected above the palate.

In this projection, the patient's chin is extended, ensuring that it aligns correctly with the image receptor. This alignment helps reduce any distortion of the sinuses and provides a detailed view. The resulting images allow for easy evaluation of the maxillary sinuses for conditions such as sinusitis or other pathological changes.

Other projections, such as lateral or AP, do not focus specifically on the maxillary sinuses, often providing less optimal views of these structures. The submentovertical position is primarily used for demonstrating the base of the skull and does not adequately visualize the maxillary sinuses.