What is the diagnosis for a left maxillary central incisor that has not erupted with a large radiopaque ball?

The diagnosis for a left maxillary central incisor that has not erupted and presents as a large radiopaque ball is consistent with an odontoma. An odontoma is a type of benign tumor that arises from odontogenic tissue and can be classified into two types: compound and complex.

In this case, the large radiopaque ball suggests the presence of an odontoma, particularly a compound odontoma, which usually manifests as multiple tooth-like structures or a single large radiopaque mass. The failure of the central incisor to erupt can be attributed to the presence of the odontoma, which physically obstructs the eruption path of the tooth.

Choosing this diagnosis aligns with the common clinical presentation of odontomas, which are often found incidentally during radiographic examinations when assessing unerupted teeth. Other diagnoses do not present with a large radiopaque structure in the same manner, making odontoma the most fitting explanation for the scenario described.