[Calvarial Intraosseous Schwannoma of the Frontoparietal Bone: A Case Report]

Calvarial intraosseous schwannoma is very rare bone tumor. Herein we report the case of a 24-year-old woman with an intraosseous schwannoma of the right frontoparietal bone. The patient had a minor head trauma caused by a traffic accident. The patient was examined by a brain computed tomography (CT) and accidentally found a calvarial bone tumor. On local examination, there was no scalp swelling and tenderness. Magnetic resonance imaging (MRI) showed isointensity of the tumor within the brain cortex on T1-weighted image (WI) and high intensity on T2-WI. On the diffusion-weighted images, the isointensity of the tumor was again depicted. The mass was strongly enhanced by gadolinium administration. Subsequently, the tumor was totally removed and was yellowish, well demarcated, and situated in the diploë intraoperatively. The inner table was widely erosive and there was a mild adhesion between the mass and the dura mater. The pathological diagnosis was an intraosseous schwannoma. We reviewed previous reports and discussed.