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Average anteroposterior diameters of the cervical spinal canal plotted by cervical level in 4 groups of patients. The plots of the patients with Chiari and without syrinx appear similar as do the plots for the groups without Chiari malformation. The group with Chiari lacking a syrinx includes only 2 individuals, explaining perhaps the more erratic course of the plot. The other groups had ≥8 members.
