RESUMO
Unicystic ameloblastoma is a tumor of odontogenic origin. It is not a rare neoplasm and most often the lesion is asympthomatic. However, large lesions may cause painless swelling of the jaws. Here we report a case of unicystic ameloblastoma with pain, swelling of the posterior jaws along with teeth mobility. Samples of incisional biopsy of the lesion and also interaoperative frozen section were sent for pathology and for both samples pathology report was solid ameloblastoma. Due to observing a thick fibrotic wall during the operation, the surgeon decided to perform enucleation. Knowing histopathologic variations of odontogenic tumors and also knowledge about differential diagnosis and clinical and radiographic features can lead to appropriate diagnosis and treatment planning