Fig. 1. Magnetic resonance image without contrast demonstrating posterior epidural and subdural fluid collections in the cervical and upper thoracic vertebral column (small arrows). Arrowhead depicts arachnoid mater. Note loss (i.e. , translocation) of cerebrospinal fluid anterior to the spinal cord (large arrows). The posterior fluid collection resulted in anterior spinal cord displacement against the posterior aspects of the lower cervical (beginning at C4) and thoracic vertebral bodies (large arrows).