Unicystic Ameloblastoma as a Differential Diagnosis for Odontogenic Cysts

Unicystic ameloblastoma (UA) is a variant of the solid or multicystic ameloblastoma. Radiographically, though the unilocular appearance is common, it can produce multilocular lesions also. Histologically, the minimum criterion for diagnosing a lesion as UA is the demonstration of a single cystic sac lined by ameloblastomatous epithelium often only in focal areas with or without areas of intraluminal or intramural proliferation or both. The clinical and radiologic presentation of UA can give a confusing picture of odontogenic cysts especially when it is seen in the inter-radicular or periapical area. Also, tooth associated UA may show features similar to dentigerous cyst. Hence histopathologic examination is essential to diagnose such cases. Here we present such a lesion which was initially diagnosed as an odontogenic cyst.