Peripheral-type ameloblastic fibrodentinoma with features of so-called "immature dentinoma".

We report herein a rare case of peripheral-type ameloblastic fibrodentinoma (PAFD) with features of so-called "immature dentinoma" in the gingiva. The patient was a 51-year-old woman, who presented to our hospital complaining of mild swelling in the left upper buccal gingiva. Periapical radiography of the area did not reveal obvious bone resorption and the provisional clinical diagnosis was a benign tumor. The entire mass was excised under general anesthesia, and the pathological diagnosis was PAFD according to the classification by World Health Organization. More precisely, the detail of the histological examination revealed that our case was compatible with unusual type of ameloblastic fibrodentinoma, so-called "immature dentinoma". The postoperative course was satisfactory and the excised area has remained free of recurrence for 5 years.