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Intradural intramedullary tumor: preoperative T2 weighted sagittal (a) and T1-Gadolinium enhanced axial (b) MRI scans of an intramedullary cervical cavernoma. Using ioUS the tumor is identified and located before dural opening (c) so as to evaluate the tumor features (more homogeneous on US than on MRI) and its relationships with surrounding structures. The direct visualization allows also to correctly place the myelotomy. The surgical field is also checked after tumor removal (d)
