Ameloblastoma of the maxilla is a rare odontogenic tumor that rarely 
metastasizes. We report a patient who was diagnosed with ameloblastoma of the 
maxilla 6 years ago and had undertaken the operation. However, the recurrence 
occurred, and further pulmonary disease was discovered. He did not experience 
chest pain and other respiratory systematic symptoms. Whether this metastasizing 
ameloblastoma should be ranged among malignant or benign is discussed. The term 
benign metastasizing ameloblastoma is suggested to describe this kind of tumor.