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Figure 1: (a): Preoperative T2-weighted MRI shows crowded posterior fossa and Chiari malformation with compression of cervicomedullary junction. Syringomyelia is noted from C2 to C5 levels. Preoperative CT (b-e): Midsagittal CT (b) shows the dens violating Chamberlain line. Axial CT (c) shows pars interarticularis defect on right side and lamina defect on left side (arrow). Three-dimensional CT, posterior view (d, right and e, left) clearly demonstrates the bony defects (arrow). (f) Postoperative CT demonstrates placement of screws in bilateral pedicle of C2

Figure 1: (a): Preoperative T2-weighted MRI shows crowded posterior fossa and Chiari malformation with compression of cervicomedullary junction. Syringomyelia is noted from C2 to C5 levels. Preoperative CT (b-e): Midsagittal CT (b) shows the dens violating Chamberlain line. Axial CT (c) shows pars interarticularis defect on right side and lamina defect on left side (arrow). Three-dimensional CT, posterior view (d, right and e, left) clearly demonstrates the bony defects (arrow). (f) Postoperative CT demonstrates placement of screws in bilateral pedicle of C2