Panoramic X-ray showing a large anterior radiolucency with a radiopaque border on the mandible. Diagnosis:

Correct answer: C. Traumatic bone cyst (Simple bone cyst)

• A. Ameloblastoma classically shows a multilocular ('soap bubble') radiolucency, often causing root resorption, rather than a simple well-corticated unilocular lesion.
• B. A central giant cell granuloma typically appears as a multilocular radiolucency, often crossing the midline in younger patients, without the smooth scalloping border typical of a traumatic bone cyst.
• C. Correct. The traumatic (simple) bone cyst is a well-defined unilocular radiolucency with a corticated/radiopaque border that classically scallops between roots without displacing them, often found incidentally in the anterior mandible.