This frontal X-ray of the paranasal sinuses (PNS) shows a straight-on view of the air-filled cavities within the skull. X-rays pass easily through air, causing clear, healthy sinuses to appear as dark, well-defined spaces surrounded by bright white bone.

The frontal sinuses sit prominently above the eyes in the lower forehead. They appear as large, dark, cloud-like pockets divided down the middle by a thin bony wall. Just below them, the two orbital cavities (eye sockets) flank the nose, outlined by a stark ring of bright bone.

Between the eyes lies the nasal cavity, split vertically by the straight white line of the nasal septum. Inside this space, the delicate, scroll-like structures of the nasal turbinates are visible. Tucked behind the bridge of the nose are the ethmoid sinuses, appearing as a small cluster of tiny, dark air cells.

Flanking the nasal cavity are the maxillary sinuses, the largest of the paranasal cavities. Located inside the cheekbones directly beneath the eye sockets, they form two large, dark, inverted triangles. The sharp contrast and dark interiors of these triangles indicate they are filled with air rather than fluid.

At the bottom of the frame, the upper and lower rows of teeth are visible, anchored securely into the jawbones. This symmetrical perspective allows clinicians to check if the air cavities are clear, evaluate the nasal passages, and look for any structural imbalances in the midface.