Benign osteoblastoma is a rare tumor of bone, usually confined to the long bones and vertebrae. Its occurrence in the calvaria is extremely rare. The authors report a case of a temporoparietal lesion in a 29-year-old male. Computed tomography revealed a low-density mass, which was irregularly enhanced by contrast medium. Magnetic resonance imaging demonstrated a mass of low intensity on T₁- and high intensity on T₂-weighted images. Angiography confirmed the presence of a large epidural mass in the left temporal region. The tumor was excised and the pathological diagnosis was benign osteoblastoma.