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Normal anatomy. Axial, sagittal, and coronal FIESTA-C MRI images (a–c) demonstrates the high signal intensity of epidural fat and CSF, due to their similar high T2/T1 ratios. Solid structures such as disc annulus, cortical bone, muscles, ligaments, and neural structures have a similar low signal intensity. Blood within the major vessels have an intermediate signal intensity (asterisk). Dorsal root ganglia have an intermediate signal (arrow).
