Abnormal odontogenesis: report of case.

All that can be concluded from the available information is that the lesion was a variation on the spectrum of developmental anomalies without a known etiology or a conclusive diagnosis. This lesion is most probably related to an aborted formation of a maxillary first premolar or immature complex odontoma. More information could have been obtained, if the surgery had been delayed until further development of the lesion and of the patient's dentition had occurred; but this was not feasible, since definitive treatment was required. Further radiographic and clinical follow-up may assist in confirming the suspicion of a displaced maxillary left first premolar, when the patient's dentition is further developed. Since the position of the impacted primary tooth had not changed by the first follow-up examination, it is anticipated that it will not erupt on its own and will require further treatment, possibly in the form of surgical exposure and orthodontic manipulation or surgical removal and space management.