What should be visible in a properly executed lateral projection of the paranasal sinuses?

In a properly executed lateral projection of the paranasal sinuses, superimposed orbital roofs are essential as they indicate correct positioning and alignment during the imaging process. This alignment ensures that the sinuses are accurately visualized without distortion. The superimposition of the orbital roofs implies that the X-ray beam has been directed properly, allowing for a clear and precise representation of the paranasal sinuses, particularly the frontal and maxillary sinuses, as well as the ethmoid sinuses.

This positioning enables radiologists to assess the sinuses effectively for any pathological conditions. A clear nasal cavity, while often a desired element in imaging, is not a definitive marker for a properly executed image. Visibility of only the maxillary sinus limits the scope of assessment, and blurred cranial structures can indicate issues with exposure or positioning, which would hinder accurate diagnosis.