Axial T2-weighted MR image shows normal flow void in the right internal jugular vein (arrows), whereas flow-related enhancement can be seen in the left internal jugular (arrow) vein due to sluggish flow. Axial T2-weighted MR image shows normal flow void in the right internal jugular vein (arrows), whereas flow-related enhancement can be seen in the left internal jugular (arrow) vein due to sluggish flow. Yahya Paksoy et al. AJNR Am J Neuroradiol 2003;24:1364-1368 ©2003 by American Society of Neuroradiology