Abstract
Ameloblastic fibromas are generally classified as odontogenic mixed tumors and their occurrence is rare.
A segmental ameloblastic fibroma was resected from the left maxilla of a three-year-old boy. The tumor was composed of seven sections, and covered with a thick membrane. Odontogenic epithelium was observed in the largest tumor segment. It surrounded the tumor and in places invaginated into it. In addition, thick epithelial strands formed small cysts, similar to ameloblastomas. The remaining six tumor sections histopathologically showed the same findings of odontogenic mesenchyme as the largest segment.
These findings suggest that the ameloblastic fibroma originated from odontogenic ectomesenchyme tissue.
