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Figure 42-1. The relationship of spinal segments and roots to the vertebral bodies and spinous processes. The cervical roots (except C8) exit through foramina above their respective vertebral bodies, and the other roots issue below these bodies. (From Haymaker W, Woodhall B: Peripheral Nerve Injuries, 2nd ed. Philadelphia, Saunders, 1953, by permission.)
Figure 42-2. MRI of spinal epidural abscess compressing the dorsolateral cervical spinal cord. Sagittal (left) and axial (right) T1 gadolinium-enhanced images show the peripherally enhancing pyogenic collection (arrows) which extends over several vertebral segments.
Figure 42-3. Sagittal T2-weighted MRI in Pott tuberculous spine disease. The angulated deformity of the thoracic spine is highly characteristic. (Courtesy of Dr. Randall Edgell, New York University Medical Center.)
Figure 42-4. T2-weighted MRI of acute postinfectious myelitis in the sagittal (A) and axial (B) planes. There is abnormal T2 hyperintensity within the dorsal spinal cord and the cord is mildly enlarged. Mild enhancement following gadolinium infusion was noted (not shown).
Figure 42-5. MRI of necrotic myelopathy in a patient with neuromyelitis optica. Note the long extent of the lesion and thinning of the cord as the acute illness subsides.
Posterior Spinal A.Anterior Spinal A.Penetrating A.Sulcal A.Radicular A.Segmental A.AortaRadiculomedullaryartery of Adamkiewicz(at T10-L1 level)
Figure 42-6. Anterior view of the spinal cord with its segmental blood supply from the aorta. (Reproduced with permission from Prasad S, Price RS, Kranick SM, et al: Clinical reasoning: A 59-year-old woman with acute paraplegia. Neurology 69:E41, 2007.)
Figure 42-7. Spinal cord infarct: Sagittal (left) and axial (right) T2 MRI of a man who experienced sudden onset of bilateral flaccid arm weakness. Note the abnormal T2 hyperintensity restricted to the ventral spinal cord, including both ventral horns.