Hybrid odontogenic tumor masquerading as a salivary gland lesion: A diagnostic predicament.

Hybrid odontogenic tumors are sporadic, where the distinctive areas of more than one odontogenic tumor tissue type have been reported. The occurrence of adenomatoid odontogenic tumor (AOT) with calcifying epithelial odontogenic tumor (CEOT) like areas histologically simulating salivary gland pathology is an unusual finding that has not been previously reported in the literature. We report the case of a 32-year-old female presenting with slow-growing firm swelling, radiographically as a pear-shaped radiolucent lesion in the interdental region of maxillary incisors. Histologically, the tissue showed nests and anastomosing strands of the bland cuboidal to squamoid epithelial cells showing nuclear pleomorphism, hyperchromatism, and abundant cytoplasm with prominent intercellular bridges focally. Multiple basophilic calcifications, amyloid-like material, duct-like formation, and mucinous spillage are seen. Tumor cells showed immunopositivity for CK 7, CK 19, CK 8/18 and low Ki67, p63, and immunonegativity for S100 suggesting of a hybrid lesion of CEOT with AOT.