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Fig. 7. Comparisons of volume and surface area measurements between untreated and PEG-treated spinal cords. (A) The normalized volume measurements for intact parenchyma, lesion and cystic cavities. The volume measurements for intact parenchyma and cavitation were statistically significantly different (asterisks) between the control group and both PEG-treated groups. (B) The normalized surface area measurements for the same groups. The surface area measurements for lesions were statistically significantly different between the control group and both PEG-treated groups. There was a statistically significant difference in the amount of cavitation between the immediate and delayed PEG-treated groups. Values are means + S.D. *Indicates a significant difference between control and experimental spinal cords (P<0.05; unpaired Student’s t-test). {dagger}Indicates a significant difference between immediate and delayed PEG-treated spinal cords (P<0.05; unpaired Student’s t-test).