Three pathways between the sacroiliac joint and neural structures exist.

ings?; 3) can selective white matter tract involvement be seen on MR images early in the patient’s myelopathic state?; and 4) can magnetization transfer ratios (MTRs) be applied to normal-appearing cord tissue to show decreased MTRs in affected spinal cords? Although these and other issues are left unresolved by Chong’s investigation, the article can serve as a springboard for important studies. Future studies could investigate the effect of newer treatment protocols for the imaging of patients with AIDS-associated myelopathy and the precise distribution of signal abnormalities in the cord in both the early and late stages of this complex disease.