Patient with intraspinal abnormalities Patient with intraspinal abnormalities.A, Axial contrast-enhanced T1WI through the region of the cauda equina shows marked abnormal enhancement of the nerve roots, which appear as bright dots in the thecal sac.B, Sagittal gadolinium-enhanced T1WI demonstrat... Patient with intraspinal abnormalities.A, Axial contrast-enhanced T1WI through the region of the cauda equina shows marked abnormal enhancement of the nerve roots, which appear as bright dots in the thecal sac.B, Sagittal gadolinium-enhanced T1WI demonstrates prominently enhancing nerve roots. Muhammad Ali et al. AJNR Am J Neuroradiol 2005;26:289-297 ©2005 by American Society of Neuroradiology