Venographic studies of an osteoporotic VCF Venographic studies of an osteoporotic VCF. A, Lateral digital subtraction venogram shows nonionic radiographic contrast material leaking into both adjacent disks through endplate fractures.B, Lateral venogram without digital subtraction of the same site, o... Venographic studies of an osteoporotic VCF. A, Lateral digital subtraction venogram shows nonionic radiographic contrast material leaking into both adjacent disks through endplate fractures.B, Lateral venogram without digital subtraction of the same site, obtained approximately 10 minutes after A. Note that the radiographic contrast agent is still apparent and thus may have impeded visualization of possible cement leaks during PVP. John M. Mathis et al. AJNR Am J Neuroradiol 2001;22:373-381 ©2001 by American Society of Neuroradiology