Figure 3 :Preoperative sagittal T1-weighted (a) and T2-weighted (b) and axial T1-weighted (c), T1-weighted with contrast (d), and T2-weighted with contrast (e) MR images demonstrating a homogenously enhancing IDEM tumor at the C1 spinal cord level (d), predominantly on the left side. The surgical trajectory using a midline dorsal exposure to the tumor is shown (arrow).