On a panoramic radiograph, an arrow points to a U-shaped radiopaque structure inferior to the mandibular body. What structure is this?

The hyoid bone is a U-shaped (horseshoe-shaped) bone located in the anterior neck, inferior to the mandible at the level of C3. On panoramic radiographs, it appears as a bilateral radiopaque horseshoe-shaped structure below the mandible. It is a common anatomical landmark identified on panoramic radiographs. The hyoid bone is the only bone in the body not articulating with any other bone.