Photomicrographs showing histopathological features of unicystic ameloblastoma and calcifying odontogenic cyst. (A) Cystic component (right) and mural ameloblastomatous proliferation (left) in an intra-mural unicystic ameloblastoma (HE ×50). (B) Mural proliferation is composed of multiple ameloblastomatous well-differentiated follicules subtented by a palisaded basal cell layer with nuclear polarity reverse features (HE ×120). (C) A pure intra-luminal proliferation of an unicystic amleoblastoma (HE ×100). (D) Ghost cells and dystrophic calcification in a calcifying odontogenic cyst (HE ×400).