Abstract
<h3>Background</h3> Adenomatoid odontogenic tumour (AOT) is a relatively rare and distinct benign odontogenic tumour representing 3–7% of all odontogenic tumours. It is usually detected in young patients, with three-quarters of patients younger than 20 years of age. There is a 2:1 female preponderance and 2:1 predilection for the maxilla over the mandible. Two-thirds of cases are associated with an unerupted tooth and in two-thirds of these cases the unerupted tooth is a canine. The tumours are often asymptomatic, other than swelling. Excision or curettage is the treatment of choice and documented true recurrence is very rare. <h3>Case presentation</h3> We report a 12-year-old female who presented with a non-painful swelling of the left maxillary region. An ortho-pantomogram (OPG) showed high impaction of tooth 23 associated with a unilocular radiolucent cyst surrounding the crown of the tooth. On clinical/radiological findings, the cyst was thought to be a dentigerous cyst. We received a 27mm, smooth surfaced, encapsulated, mixed cystic and solid soft tissue mass surrounding the crown of a normally formed lateral incisor. Histology revealed an adenomatoid odontogenic tumour. <h3>Conclusion</h3> AOT is a relatively rare odontogenic tumour with a benign clinical course, which essentially does not recur following excision.
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