Solid variant of keratocystic odontogenic tumor with ameloblastomatous transformation: a case report and review of the literature.

The solid variant of keratocystic odontogenic tumor is an extremely rare tumor. Its clinical and pathologic features remain poorly defined, even in the 2005 World Health Organization odontogenic tumor classification. We report an unusual lesion in a 38-year-old female Chinese patient. The lesion demonstrated the solid or multiple cystic architecture of a keratocystic odontogenic tumor, but also exhibited ameloblastomalike lining epithelium in some areas. The complex histopathology made a pathologic diagnosis difficult. Finally, the lesion was diagnosed as solid variant of keratocystic odontogenic tumor with ameloblastomatous transformation. We present the clinical and pathologic details of the case, and review the relevant literature.