On a periapical radiograph, you identify a radiopaque mass containing tooth-like structures (small denticles) within the jaw. This is MOST consistent with:

An Odontoma is the most common odontogenic tumor and appears radiographically as a radiopaque mass containing calcified tooth-like structures (denticles). Two types: Compound odontoma (organized tooth-like structures, resembles small teeth) and Complex odontoma (disorganized calcified mass). Often found incidentally in young patients, associated with unerupted teeth. Treatment is enucleation.