FIG 2. Placement of the guidewire under fluoroscopic guidance.

A, Lateral view in cadaver 1 shows the dorsal catheter (small arrow) posterior to the spinal cord and the ventral catheter (large arrow) anterior to the spinal cord. Diamond shows the tip of the ventral catheter in the sylvian fissure.

B, In cadaver 2, contrast material fills the third ventricle and spills through the foramina of Munro (arrows) into the lateral ventricles.