Figure 2.

Diagrams from transverse sections through spinal cords at T3 of two cadavers in forward flexion and extension showing the rounder shape of the cord in extension. Chu et al [2-4] describe a similar difference in apical spinal cord shape between thoracic AIS and normal subjects measured as the ratio of antero-posterior (AP) to transverse (TS) diameter of the cord (see Response to Comment 10). Diagrams drawn from specimens reported by Breig [17].