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Corresponding Author. Ricardo Santiago Gomez, Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, School of Dentistry. Av. Antônio Carlos 6627, Belo Horizonte, Minas Gerais, Brazil. CEP 31270-901. phone: +55 31 3409-2477.
Adenoid ameloblastoma with dentinoid is an uncommon benign odontogenic neoplasm, and
its unicystic variant seems to be even rarer. A 34-year-old man was referred for evaluation
of an asymptomatic swelling in the posterior maxilla. Intraoral examination showed
an expansive lesion, soft to palpation, covered by a normal color mucosa. Cone-beam
tomography revealed a well-defined unilocular hypodense tumor involving the left maxillary
sinus. Histopathological examination of the surgically excised specimen showed a cystic
tumor lined by an ameloblastic-like epithelium containing columnar basal cells with
hyperchromatic and polarized nuclei. In some areas of the capsule, the tumor showed
mural infiltration by sheets of cells containing central whirling structures. Dentinoid
material was also observed in association with ameloblastic-like cells. The tumor
was BRAF and KRAS wild-type. Collectively, these findings were consistent with the diagnosis of a unicystic
variant of adenoid ameloblastoma with dentinoid.