An Unusual Case of a Malignant Peripheral Nerve Sheath Tumor

285 omas are the cavernous type, whereas vertebral hemangiomas are most frequently of the capillary type. The bony trabeculae within this tumor are thought to be the result of osteoclastic resorption and osteoblastic activity by the growing vascular tumor [5]. The treatment of choice for intraossoeus hemangioma is en bloc resection with an adequate normal bone margin, and the bony defect can be reconstructed by various methods. Other therapeutic methods include curettage, radiotherapy, and embolization. However, partial removal is likely to be followed by recanalization. Radiotherapy can reduce the tumor volume and has demonstrated symptomatic improvement, but it has the risk of radiationinduced carcinoma. Therefore, radiation therapy should be reserved for cases that are unresectable or have a residual tumor from subtotal resections. Curettage is not a good treatment modality because it can produce excessive bleeding and shows a high recurrence rate. In conclusion, intraosseous cavernous hemangioma is a rare bone tumor in the calvarium and demonstrates similar radiologic findings to other bone tumors. It can thus be confused with other bone tumors. Therefore, the diagnosis is frequently made in the operative field by its hemorrhagic features and confirmed by histologic examination. The treatment of choice is surgical resection with an adequate normal bone margin.