Aggressive fibromatosis of the infratemporal region

Aggressive fibromatosis (AF) is identified to involve subcutaneous tissue, muscle, and neurovascular structures. Though the tumor is of bland histological features and low mitotic activity, it has a aggressive infiltrative growth pattern along tissue planes and invasion of adjacent tissue. Here we present a rare case report of a 19-year-old man with AF of the infratemporal region. Tumor growth was rapid and involved the infratemporal region. Biopsy was taken and in histological examination showed a tumor consisting of spindle-shaped fibroblast cells proliferating in fascicles within a collagenous stroma with rare atypia. Microscopically, a diagnosis of AF was rendered.