Intravasation of Pantopaque during myelography without associated traumatic tap.

Intravasation of Pantopaque at myelography is usually related to entry or partial entry of a spinal needle into an epidural vein . This may occur initially, while positioning a spinal needle, or during repuncture for removal of contrast agent. We observed an atraumatic lumbar puncture at the L3-L4 interspace made with a single pass, in which intravasation of contrast material occurred in the midsacral region at about S2 , remote from the puncture site. The findings confirm that a pathway may exist between the spinal arachnoid granulations and the epidural venous plexus.