Infantile fibromatosis, which is a fibromatous lesion characterized by tumor invasion of soft and hard tissue, occurs rarely in the head and neck. We report on a 3-year-8-month-old girl with infantile fibromatosis in the submandibular region.
An orthopantomogram and computed tomographic and magnetic resonance imaging scans showed a large submandibular mass with resorption of the mandibular bone.
Microscopic examination revealed proliferation of elongated, spindle-shaped fibroblasts with interlacing bundles of collagen fibers. Cellular atypia and mitotic figures were sparse. There has been no recurrence as of 4 years 10 months after treatment.
