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Uptodate Reference Title
Left C1 schwannoma
Left C1 schwannoma
Noncontrast CT (A) shows well-circumscribed osteolysis (arrows) of the anterior arch of C1. Pre- (B) and postcontrast (C) T1-weighted MRI shows an enhancing intradural and extramedullary mass (thick arrows) that extends laterally through the left C1 neural foramina. Sagittal postcontrast T1-weighted image (D) shows the extent of enhancing tumor in the neural foramen and paraspinal soft tissues.
CT: computed tomography; MRI: magnetic resonance imaging.