When considering the scenario of a left maxillary central tooth that is impacted and accompanied by a large radiopaque ball, the correct answer is odontoma. An odontoma is a type of benign odontogenic tumor that can present as a well-defined radiopaque mass in the jaw. They are typically composed of enamel, dentin, and sometimes pulp tissue, which gives them a characteristic radiopaque appearance on radiographs.
Odontomas can appear as compound or complex forms, with the complex odontoma being more likely to present as a single radioopaque mass without the organized tooth-like structures found in compound odontomas. This radiopaque ball can be indicative of an odontoma that has formed as a result of abnormal tooth development and is often associated with impacted teeth.
In contrast, while odontogenic tumors can also be radiopaque, they generally present with more complex features and a broader range of radiographic appearances. Cystic lesions usually appear radiolucent rather than radiopaque and are not likely to present as a solid, radiopaque mass. Lastly, a supernumerary tooth might show up as an additional tooth structure but would not typically present as a singular, large radiopaque mass. Therefore, the presence of a large radiopaque ball in the context given