A trauma clinic receives an ambulatory adult with a suspected depressed left zygomatic arch after a sports collision and also needs routine sinus screening for chronic congestion. The physician wants the arch profiled without overlap and sinuses shown air-filled in one erect view. Which projection pairing best demonstrates the zygomatic arch and paranasal sinuses?
Select an answer to reveal the explanation.
Short Explanation
You’re picking views that let air do the work. Axial arch plus upright Waters makes your sinus air pop, like opening curtains to see dust in sunlight.
Full Explanation
The submentovertex projects the zygomatic arches inferior to the cranial vault in axial profile free of superimposition, ideal for depression or displacement, while the erect Waters with extended neck and mouth open projects the petrous ridges below the maxillary antra and shows air-filled sinuses with any air-fluid levels dependent to gravity. The distractor pairing lateral skull and supine Caldwell superimposes arches and removes gravity dependence so fluid levels and sinus aeration are poorly shown; the distractor pairing PA skull and decubitus Townes misapplies Townes for frontal and occipital detail and does not isolate the arch tangentially; the distractor using reverse Waters for arch detail and prone Waters inverts positioning so the arch remains obscured and dependent fluid shifts away from standard evaluation. Exam caveat: erect positioning matters for sinuses to demonstrate aeration and levels. Practical check: ensure no rotation, chin extension adequate, and petrous ridges projected just below maxillary sinuses on the Waters.