Juvenile fibromatosis with invasion of the mandible: report of two cases.

Two cases of juvenile fibromatosis involving the mandible were found in children aged 1 1/2 and 2 1/2 years. The tumors, while histologically benign, were clinically aggressive, causing bone erosion and destruction and invading adjacent normal soft tissue structures with firm fibrous tumor extensions. In each instance, the lesion was completely removed by radical local surgery with no recurrence after a seven-year follow-up. The pertinent literature, consisting of six previously reported cases, has been reviewed.