recurred 22%in the case reported by Carr and associates recurrence was detected 4.5 years later. Blankestijn and colleagues (1986) recommended a 10-year postoperative follow-up for patients with ameloblastic fibroma. According to Reichart and Zobl (1978), the ameloblastic fibroma may undergo malignant transformation into amelo- fibrosarcoma. In 1978, they found 23 cases of amelo fibrosarcoma in the literature. In their case, a 16- blastic year-old adolescent had fibrosarcoma in a region treated 4 ears previously for ameloblastic fibroma. In 1988, Wood and colleagues found 43 cases of ameloblastic fibrosarcoma n the literature and added a new case. Although their case developed de novo, they found that more than half the re ported cases arose from a previously existing benign amelo blastic fibroma. Among cases that underwent malignant transformation, a history of multiple surgical procedures was a prominent feature. The average patient age was 26 years, and the male-to-female ratio was 1.6:1. The mandible was involved in 73% of the cases and the maxilla in 27%. A melo blastic fibrosarcoma tends to recur, especially when by curettage or local excision. Metastases also have been reported. RADIOLOGY (Figs. 11-23 to 11-20 The findings of Trodahl (1972) shed some light on the value of routine radiologic examinations in the dental office be- cause 17% of their cases were detected as incidental radio logic with many lesions, the radio characteristics of this tumor have been described poorly. The following is a summary 1. In patients younger than 20 years, cases are found in the posterior mandible 2. An impacted is present, but not alway This large and e t because an unerupted a tooth is invo radiologically