[Minor head injury can result in fracture of the anterior wall of sinus frontalis].

A 17 year-old boy suffered a minor head injury after a somersault in which his knee hit the forehead. He had a swelling over the right frontal sinus with unbroken skin. A computed tomography revealed a fracture of the anterior wall of the frontal sinus with a displaced bone fragment. The posterior wall was undamaged, and no intracranial injury was evident. The nasofrontal duct was intact. The fragment was repositioned surgically without complications. The frontal sinus is considered resistant to low-energy trauma. This dogma, however, has exceptions.