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Figure 1 :Sagittal T1-weighted and T2-weighted images show the mass (arrows) that extends into the spinal canal (arrow heads). S1, S2, S3 and S4 denote the body of the four sacral vertebrae and P1, P2 and P3 denote the posterior elements of the first to third sacral vertebrae in the T1 image

Figure 1 :Sagittal T1-weighted and T2-weighted images show the mass (arrows) that extends into the spinal canal (arrow heads). S1, S2, S3 and S4 denote the body of the four sacral vertebrae and P1, P2 and P3 denote the posterior elements of the first to third sacral vertebrae in the T1 image