Needle placement of myelography.
Proper placement of the entire bevel of the spinal needle within the subarachnoid space at myelography is necessary to prevent partial extra-arachnoid deposition of the contrast medium. A Cuatico aspiration cannula passed through the spinal needle at the time of spinal puncture serves to indicate the depth of the needle tip within the subarachnoid space.
D006801:Humans; D009192:Myelography / Q000295:instrumentation* / Q000379:methods; D009339:Needles