A periapical radiograph of the anterior maxillary region shows an arrow pointing to a bony structure in the corner of the image. What anatomical structure is being indicated?

Correct answer: B. Coronoid process of the mandible

• A. INCORRECT. The zygomatic process of the maxilla is typically seen in posterior maxillary periapical or panoramic radiographs, not in anterior maxillary periapical films.
• B. CORRECT. The coronoid process of the mandible can appear as a radiopaque triangular structure in the posterior corners of periapical radiographs, particularly maxillary molar/premolar periapicals, and occasionally in anterior films due to positioning. It is a normal anatomical landmark that should not be confused with pathology.
• C. INCORRECT. The pterygoid plates are located posterior to the maxillary tuberosity and would not typically appear in an anterior periapical radiograph.
• D. INCORRECT. The anterior nasal spine is a midline structure and would appear centrally in the anterior maxillary periapical, not in the corner.