Intraoperative sonography of meningiomas.

Four meningiomas were scanned during surgery using a commercially available, real-time sector sonographic scanner. Each lesion was ext remely well defined , and its effects on the surrounding brain were easily characterized by su rround ing edema and displaced ventricles. In one case, sonography demonst rated the nonresect ability of a portion of the tumor because of involvement of the superior sagittal sinus. Th is preliminary experience suggests sonographic imaging may be useful during the resection of meningiomas.