Aneurysmal bone cyst of the frontal sinus

Aneurysmal bone cysts are benign, vascular, cystic osseous tumors. Approxim ately 2% of all aneurysmal bone cysts are found in the head and neck region , with the most common site being the mandible. We report a case of an aneu rysmal bone cyst arising from the frontal sinus in a pediatric patient. The diagnosis was suggested through various radiographic studies, with the fin al pathologic diagnosis confirmed after tumor excision. Complete en-bloc ex cision was performed by using a bifrontal craniotomy approach, with immedia te reconstruction of the defect by using a split calvarial bone graft.