Abstract
1) This is a rare case of atypical odontogenous mixed tumor that occurred in the left maxilla of a man of 27 years of age. 2) The histological structure of the tumor consists of 2 parts of follicular dental cyst and hard odontoma. 3) It is very rare that 2 kinds of odontogenous tumors occured in the form of a perfect cyst. 4) This case suggests us that follicular dental cyst and odontoma may originate simultaneously from a single tooth germ.