Historically Metrizamide replaced Pantopaque as the contrast agent of choice for Myelography.
2.
To obtain images of the cervical region the patient is then carefully tilted cephalad ( toward the head ) so contrast agent ( particularly Pantopaque ) can enter the neck region.
3.
This speaks to the inability to remove the heavier or more viscous Pantopaque without aspirating it with spinal fluid ( CSF ) through a lumbar puncture needle in the low back ( sticking up vertically ) or back of the neck.
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