Which position best demonstrates bilateral depressed fractures of the zygomatic arches?

The submentovertex (SMV) projection is particularly effective for demonstrating bilateral depressed fractures of the zygomatic arches. This positioning allows for visualization of the zygomatic arches in profile, which is crucial for assessing the integrity and alignment of these structures. By angling the x-ray beam beneath the chin, the SMV view minimizes superimposition from the maxilla and mandible, offering a clear view of the zygomatic arches and any potential fractures or displacements.

In this projection, the zygomatic arches are projected laterally, allowing radiologists to assess for any fractures, especially those that may occur bilaterally due to trauma. The ability to visualize both arches prominently can aid in accurately diagnosing the extent and nature of the fractures.

Other positions may not provide the same level of detail or could result in obscured views due to the overlying structures. Therefore, utilizing the SMV projection in cases of suspected zygomatic arch fractures is considered the best practice for achieving the desired diagnostic clarity.