Figure 2From: Erosion in the occipital bone caused by the fixation instrument used for posterior atlantoaxial fusion -report of 4 cases- MPR-CT images of a 61-year-old man obtained at 6 months following C1-C4 fusion. A. The sagittal image shows that the tip of the rod above the lateral mass screw protrudes into the occipital bone. B. The coronal image shows that the occipital bone is eroded by the tip of the rod on the left.Back to article page