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Abstract
Intraoperative spinal sonography was used in 95 spinal lesions including 44 spinal cord tumors and 37 syringomyelias. Syrinxes and cysts were anechoic and as a result the septum in the syrinxes could be detected, but the small cysts could not be detected.Intradural extramedullary tumors were hyperechoic and were visualized clearly because the contrast with the anechoic CSF around them was clear. Central echoes in these cases were observed near the tumors.But the central echoes of intramedullary tumors could not be obtained over the wide tumor area. Ependymoma and hemangioblastoma were hyperechoic because the rostral or caudal cysts were anechoic. But in some cases of hemangioblastoma, they were not so hyperechoic and not well-demarcated because their cysts were small. Astrocytoma was irregularly hyperechoic and the boundary of the tumor was not clear.In order to demonstrate the lesions more clearly, a high frequency probe is needed, and a smaller probe is needed so that it can be used through a small incision.
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