[A Case of Intraosseous Meningioma Suspected of Osteosarcoma Based on Preoperative Image Examinations]

Intraosseous meningioma(IM)is one of the less frequent tumors of the skull, which often cannot be distinguished from other common skull tumors based on preoperative radiological findings. Herein, we describe a case of IM suspected to be an osteosarcoma based on preoperative image examinations. A 72-year-old woman experienced an impact to her left parietal area, and a subcutaneous tumor appeared in the same area. It had enlarged gradually over seven months, although she exhibited no obvious symptoms. On preoperative diagnostic imaging, the tumor was mainly found in the skull, extending from the subcutaneous area to the intradural space, and was primarily suspected to be an osteosarcoma. After surgery, the pathological diagnosis was atypical meningioma, and there has been no recurrence for 1 year after the surgery. It is necessary for IM to be considered as a differential diagnosis for skull tumors exhibiting characteristics of osteosarcoma.