Which projection is used to demonstrate all of the paranasal sinuses?

The lateral projection is the preferred method for demonstrating all of the paranasal sinuses. This technique provides a comprehensive view of the frontal, maxillary, ethmoid, and sphenoid sinuses, allowing for a complete assessment. The lateral position helps to delineate the anatomical relationships of the sinuses and ensures that no overlapping structures obscure the sinuses on the radiograph.

In this projection, the patient’s head is positioned so that the midsagittal plane is parallel to the image receptor, and the central ray is directed horizontally. This positioning maximizes the visualization of the sinuses without distortion, which is essential for accurate diagnosis and evaluation of sinus conditions.

Other projection types, such as the AP, oblique, and supine, do not provide the same level of detail or may not adequately demonstrate all the paranasal sinuses simultaneously. Each has its own advantages in specific situations, but for a complete overview of the paranasal sinuses, the lateral projection is the most effective choice.