Table 1:

PCA pruning scale

Pruning GradePCA Distal Visualization*
1Normal length of the distal calcarine artery to the occipital pole
2Moderately reduced length of the distal calcarine artery (length halfway between occipital pole and bifurcation with the parieto-occipital artery)
3Severely reduced length of the calcarine artery (length reduced to the level of the bifurcation with the parieto-occipital artery)

  • Note:—PCA indicates posterior cerebral artery.

  • * Visualized length of the calcarine artery to the tip of the occipital pole.